The Beings of the Extra Terrestrial origin
which is Adversary of human race, more commonly known by the acronym BETA, are
a fictional extraterrestrial lifeform in the Muv-Luv series. They are mainly
featured in Muv-Luv Unlimited/Alternative, where they are the primary
antagonistic faction against humanity's forces.
Muv-Luv Unlimited and Alternative, as well
as their associated sidestories, take place in alternate universes where the
BETA were first spotted on Mars in 1958. They arrived on the Moon in 1967, and
after a brief conflict with humanity's space forces, invaded Earth in 1973.
They quickly spread from their landing point, Kashgar, and proceeded to invade
the Eurasian, Middle Eastern and Asian regions; when they finally reached in
Japan in 1998, 36 million people were killed within a week, and by 2001, the
world population was down to about 1 billion people.
The BETA vary greatly in size, with the
smallest identified strain (Soldier-class) being around 3 meters tall, and the
largest identified strains (Fort-class) at over 60 meters tall. They cannot
fly, and so shoot down anything that does with the Laser and Heavy Laser-class
BETA, rendering aircraft useless and making evacuation and transport much more
difficult.
Their very existence is shrouded in
mystery. All that mankind knows of them during Unlimited and at the start of
Alternative is that they are (obviously) hostile, are carbon-based lifeforms
(this was discovered when specimens were examined in Alternative 2), and don't
consider humans to be living beings (this was found out through the readings of
Soviet espers in Alternative 3).
During MLU/A it is revealed that only
soldiers and eishi that have been officially commisioned are allowed to see the
true forms of the BETA, which are classified at the highest level to anyone
else. However, this is never elaborated on. During Chronicles 03: Rebirth
though, the reason is revealed to be that because many of the BETA forms bear a
resemblance to humans or have humanoid features, the general populace may fear
them to be an out-of-control biological weapon developed by a rogue nation
rather than alien invaders.
They have been likened to the space
monsters from "Gunbuster " (and to a lesser extent, the Buff Clan in
"Space Runaway Ideon "): their strength lies in their numbers and
capability for a battle of attrition, and the BETA are notable for being
incredibly ugly in apperance, sometimes scaring even battle-hardened soldiers.

与人类敌对的外星起源生物种——更多以其简称BETA被熟知——是在MUV-LUV系列中的虚构外星物种。它们主要MUV-LUV Unlimited/Alternative中被提到，是人类遇到的主要敌对力量。
MUV-LUV Unlimited和Alternative以及它们的外传发生在一个平行宇宙中。在那里，1958年BETA首次在火星上被发现。它们在1967年抵达月球，在与人类宇宙军发生冲突后，在1973年入侵地球。它们快速的从登陆点喀什蔓延开，开始入侵欧亚、中东和亚洲地区。当它们在1998年到达日本时，在一周内杀死了三千六百万人。到了2001年，世界人口锐减至十亿人。
BETA在数量上十分庞大，同时最小的发现种士兵级大约有3米高，而最大的发现种要塞级达到了大约60米高。它们不能飞，但是光线级和重光线级可以打下任何东西，使得飞机变得无用以及撤退和运输变得十分困难。
它们的存在笼罩在谜团中。在Unlimited和Alternative前期中所有人都知道BETA它们是敌对的——至少看上去是、是碳基生命体（在Alternative2号计划中对样品的检验得知）、并且不认为人类是生物（在Alternative3号计划中苏联的ESP发现体得知）。
在MUV-LUV Unlimited/Alternative（简写为MLU/A）中揭示只有现役的士兵和卫士被允许看到BETA的真面目，而对其他任何人都是最高的机密，原因并未被详细说明。在编年史03中原因被揭示：许多种BETA有相似于人的特点以及有人类组织，这使得大众容易认为BETA是一种由流氓国家制造的失去控制的生物兵器而不是外星侵略者。
它们看起来像《飞越巅峰》（庵野你又出来胡闹了）中的宇宙怪兽STMC（在较少的程度上，像《传说巨神伊迪安》中的巴夫克兰人）：它们数量上占优势以及对消耗战的适应性；值得注意的是，BETA在外表上丑的不可思议，以至于善战的老兵也会被吓到。

Laser-class
Scientific name: Luxcius: Duo oculus
"Lux"
At 3 meters tall, 1.2 meters long and 1.6
meters wide,[1] the Laser-class BETA are some of the smaller anti-TSF units the
BETA field, and are lightly armored to the extent where they can be easily
taken down with 36mm cannons. Their giant eyes fire lasers that are effective
against targets of up to 10 kilometers high and 30 kilometers from the where
the Laser-class stands.
With the capability to track targets from
38 kilometers away, 12 seconds in-between each shot, and a perfect record of
never hitting allied BETA strains in a crossfire, the Laser-class played an
instrumental role in shutting down mankind's air superiority on the field of
battle and continues to be a deadly anti-air force to this day.
Due to the G-Elements required in their production, Laser-class are not normally produced by smaller hives. Their deployment at Kashgar in the early stages of the BETA war was an emergency measure. Although best known for their adaption to be used against aerial bombing and air operations, they are primarily used to break down rock and
materials.
光线级（镭射级）
学名：Luxcius: Duo oculus "Lux"
3米高，1.2米长，1.6米宽，光线级是BETA大家族中的小型对战术机作战单位，轻量装甲使得它可以被36毫米炮轻易的放倒。它们的大眼睛发射的激光对10公里高，30公里远的范围内的目标有效。因为可以追踪38公里远的目标、12秒的发射间隔以及在交火中不会伤害友军BETA的特点，光线级在打下战场上人类空军方面有重要作用，成为了致命的对空力量。因为在其生产过程中的G元素需求，较小的巢穴无法生产光线级。对BETA战争早期在喀什部署光线级是一种紧急措施。虽然因为其对抗轰炸和空军行动的适用性而闻名，它最初是用来溶解岩石和矿石的。

Heavy Laser-class
Scientific name: Magnus Luxcius: Unioculus
"Magnus Lux"
Towering over the Laser-class at 21 meters
tall (excluding the cooling wings), 15 meters long and 11 meters wide,[2] the
Heavy Laser-class is a larger strain with firepower to match. Their large size
affords them some protection against 36mm cannon fire, necessating the use of
120mm cannons for quicker kills. Their giant eyes fire lasers and are effective
against targets of up to a mere 500 meters high, and a spectacular range of
over 100 kilometers with 36 seconds in-between shots. Likewise with the
Laser-class, the Heavy Laser-class shares the distinction of never hitting
allies in the crossfire and requiring some time for its laser to reach maximum
output.
As the Magnus Lux class is G-Element
intensive, it is not suitable for mass production like other BETA of similar
size. However, their firepower is of several orders of magnitude higher than
that of the Laser-class, and cases have been documented in Operation Ouka where
HSSTs were shot down by Heavy-Laser class BETA from more than 26 000 kilometers
during atmospheric re-entry.
重光线级（重镭射级）
学名：Magnus Luxcius: Unioculus "Magnus Lux"
比起光线级达到了21米高（包括散热翼），15米长，11米宽，重光线级是一个更大的火力输出平台。它们的大尺寸给了一些对36毫米炮的保护，最好用120毫米炮来快速的杀死它们。大眼睛能击落500米高的目标，射程达到的100公里远，射击间隔是36秒。与光线级相同，重光线级不会击中友军以及需要一点时间来把光线输出最大化。
重光线级需要大量G元素来生产，所以不像同大小的BETA那样能大规模生产。但是火力比光线级高了几个数量级，在樱花作战中甚至击落了26000公里远处于大气层再入阶段的HSST（再突入型驱逐舰Hyper Surface Shuttle Transporter）。

Destroyer-class
Scientific Name: Impestusis: Arma duras
"Ruitare"
At 16 meters tall, 18 meters long and 17
meters wide,[5] the Destroyer-class is the second main strain used by the BETA
against mankind's mechanized forces. They have extremely tough frontal armor in
the form of a partial body carapace, with hardness 15 on the Mohs scale in
front. Underneath that covering are two small heads.
Due to that front carapace, it takes a
ridiculously large amount of ammunition to break through from the front, well
beyond what is acceptable for a single TSF to expend during an engagement on
just a single target. In addition, their armor boasts a regeneration ability
described as "phenomenal"; while not viable during the heat of
combat, this means that a Destroyer-class left alive will someday return to
plague its opponents again. The patterns on its shell are scars caused by
tissue regeneration; a new Destroyer-class typically has an unblemished green
front.
The armor on their foreheads is used as a
weapon when they ram into enemies, and such attacks are more powerful than the
Grappler-class' arms as the Ruitare can reach running speeds of up to 170km/h.
However, their speed prevents them from turning quickly, giving pilots who
manage to maneuver out of the way an easy kill; even 36mm cannons work if the
Destroyer-class is shot at from behind.
突击级
学名：Impestusis: Arma duras "Ruitare"
16米高，18米长，17米宽，突击级是第二大对抗人类机械化军队的力量。他们身体的前方有非常非常硬莫氏硬度达到15的壳。在壳的下面有两个小小的头。
因为前装甲的原因，从前方突破需要付出大到荒谬的努力，战术机最好绕到后方去对付它。另外，它们的装甲有一种被描述成“异常的”再生能力，虽然在激烈的战斗中无法实施，但是只要突击级存活，就能再次面对它的敌人。在壳上的花纹是组织再生形成的伤痕；崭新的突击级有一副完美的绿色的前壳。
前壳是当它们冲向敌人时的武器，这种攻击比起要击级的钳子更有力，因为突击级能加速至170公里每小时。然而它们的速度使得它们不能很好的转向，使得卫士有一种简单的方法干掉它们；从后方即使是36毫米炮也能发挥作用。

Fort-class
Scientific Name: Pergrandium: tria corpus
"Gravis"
Towering above most things on the
battlefield, the Fort-class, at 66 meters tall, 52 meters long and 37 meters
wide,[6] is the largest of the seven main strains; because of their large size,
a TSF would require 120mm cannons or close-combat weapons to cut these
behemoths down to size, with great care given to specifically target its joints
or other weak points for maximum stopping power. Otherwise, the next option
would be artillery, or battleship cannons. Their attacks with their ten legs
are extremely powerful, and can easily stab through or bash a TSF into pieces
with one hit. Each Fort-class also has a 50-meter long tentacle attached to its
rear end, with a Mohs 15 stinger on the end which secretes an extremely strong
acid; the stinger, which has been known to destroy naval warships, can be
launched as a projectile for a short distance or even swung around with a
fairly high degree of control - a Fort-class is capable of accurately attacking
targets to the side or even behind itself without hitting its own legs or body
segments. They can also carry several smaller BETA of varying strains inside
them; pilots should pay extra attention when around the corpse of a Fort-class
(especially during the messy aftermaths of a large battle), as its occupants
might be alive and well, waiting for a chance to strike.
要塞级
学名：Pergrandium: tria corpus "Gravis"
俯视着整个战场，66米高、52米长、37米宽的要塞级是七种主要种中最大的。战术机通常需要120毫米炮或者格斗武器来把这些巨兽切成块，还要小心它的友军以及瞄准弱点。另一种选择是炮兵或者舰炮。用十条腿发出的攻击十分强力，能轻易打穿战术机或者一击把战术机砸成碎片。要塞级还有一根50米长的触手连接在后部，末端是非常非常硬莫氏硬度达到15的撞锤还涂抹着超级强酸；这根触手能摧毁战舰，能把撞锤发射出去，还能以高超的控制力把它甩来甩去——它能用撞锤攻击侧面甚至后面的目标而不伤害到腿和身体。它可以携带几只跟小的BETA藏在身体里；卫士们在干掉要塞级后必须小心（特别是在大战的混乱中），因为它的乘客可能还活得好好的，等待机会去攻击。

Tank-class
Scientific Name: Manderium: 'Ungulam crus
"Equus pedis"
The Tank-class BETA is the third smallest
strain, measuring at 2.8 meters tall, 4.4 meters long and 1.9 meters wide.[7]
Infantry weapons are effective against them, but while it is lightly armored
and classified as an anti-infantry unit, the Tank-class has gained notoriety as
the smallest anti-TSF the BETA have; their physical strength and jumping
abilities are prodigous and their powerful jaws can bite through even
super-carbon, allowing it to easily catch and demolish vehicles and TSFs. In
fact this species kills more eishi, than any other.
The Tank-class rarely travels alone;
encounters usually number in hundreds if not thousands, and more if they are
part of a major BETA force, where they can make up to a massive 40% of the
entire swarm. They carry a distinctive smell of sulphur, are able to reach
speeds of up to 80km/h, and can quickly cover a short distance by jumping onto
a target; unless out of options, great care should be taken to minimize melee
contact with the Tank-class, as they have a tendecy to latch on unless killed,
and it is entirely possible for it to have bitten through a major TSF component
by then.
战车级（坦克级）
学名：Manderium: 'Ungulam crus "Equus pedis"
战车级是第三小的种类，2.8米高、4.4米长、1.9米宽。步兵武器就可以对付它们，但是因为有轻装甲并且分类为对步兵单位，战车级因其是最小的对战术机单位而声名狼藉。它们的强壮的身体和良好的跳跃能力、还有有力的能吃掉超级碳的大嘴让它们能轻易追上并吃掉载具和战术机。实际上就是它杀死了最多的卫士。
战车级很少独自行动，不是几千只就是几百只，如果是BETA军队的一部分的话还会更多，组成了整个群体的40%。他们带有特殊的硫磺臭味，能加速到80公里每小时还可以通过跳跃拉近距离；除非别无选择，必须尽可能减少与战车级进行近战，因为它们要么死了要么就是缠着不放，而且它们非常可能会咬坏战术机的主要组件。

Warrior-class
Scientific Name: Agilisis: Naris prolix
"Barrus naris"
At 2.5 meters tall, 1.7 meters long and 1.5
meters wide,[8] the Warrior-class is one of the smaller strains of BETA,
intended for anti-personnel roles and ineffective against TSFs. As they are
extremely lightly armored, even handguns and rifles are effective on them.
However, it is hard to actually hit them due to their agility, and once close
their trunk-like arm has enough strength to easily pull a man's head off.
斗士级（战士级）
学名：Agilisis: Naris prolix "Barrus naris"
2.5米高、1.7米长、1.5米宽，斗士级是最小的BETA之一，行使着对人员战斗的任务，对战术机不是很有效。由于装甲很薄，手枪和来福枪也能有效地对付它。但是因为它们很敏捷所以击中它们很困难，而且一旦接近，它们的像象鼻子的鼻肢有把人脑袋扭下来的力量。

Soldier-class
Scientific Name: Venarius: Caput grande
"Venator"
Standing at 2.3 meters tall, 1.2 meters
long and 1.4 meters wide,[9] the Soldier-class is the smallest strain of BETA
encountered on Earth. First spotted at 1995, the Soldier-class is solely
anti-personnel and ineffective against both TSFs and mechanized infantry; its
main aspect is its arm strength, which is several times that of an average
human's. In contrast, its speed is less than stellar. However this rarely seems
to be an issue as they are deployed en-masse, utilising swarm tactics to leave no
avenue of escape for their prey.
It has been confirmed that they are made
from recycled organic materials (i.e.- humans who were captured or eaten), but
it is not specified if that applies to just this strain or to all BETA.
It is unknown whether the vaginal-like
opening in the lower body of the Soldier class is actually used for
reproductive purposes.
兵士级（士兵级）
学名：Venarius: Caput grande "Venator"
站立起来2.3米高、1.2米长，1.4米宽，兵士级是地球上最小的BETA种。在1995年最初被目击，兵士级仅仅是对人作战用，对战术机和机械化军队并不是十分有效；它的主要特点是手臂很强壮，比人类的强壮数倍。另一方面，它的速度不是很出色。但是这从不是一个问题因为它们总是被一起部署，他们的猎物会发现无处可逃。
已经被证实的是它们由循环使用的器官材料制造（比如被抓走或者吃掉的人），但是没有发现这适用于所有种类的BETA。
另一个未知的是它身体下部像女生XX一样的裂口是否用于生产用途。

Carrier-class
Nickname: Megaworm
As it is a rarely-sighted and unconfirmed
strain, there is no official scientific/binomial name. Its first appearance was
when a single, massive specimen, measuring at 176 meters tall, 1800 meters long
and 176 meters wide,[10] appeared inside the Original Hive during Operation
Ouka, carrying an extremely large amount of smaller BETA inside of it. Its
sound signature was identical to that of whenever the BETA were moving deep
underground, which suggests that one of them is used whenever they do so.
During its first appearance, it was identified as "unconfirmed large
strain" (未确认大型种/mikakunin oogata-shu).
The Carrier-type BETA are currently the
most-seldom seen strain that is not part of a Hive structure; one is
encountered by A-01 in the Kashgar Hive during Operation Ouka, while two
Carrier-class make an apperance in The Day After at the Defence of Seattle; one
retreats, while the other is destroyed in combat by the use of an S-11 Device.
During combat, its size and outer body covering allowed it to resist battleship
fire, making it one of the toughest variants of the BETA yet.
母舰级（航母级）
昵称：大蠕虫
这是一种很少被目击和未证实的种类，所以没有学名。它的初次目击是一种简单、巨大的种类，高达176米，长达1800米，宽176米，在樱花作战期间在原初巢穴内出现，里面装着巨大量的BETA。它的声音信号在BETA进行地底移动时可以被听到。在初次出现时，它被命名为未确认大型种。
母舰级是非巢穴构造种中最少见的一类，一只在樱花作战期间被A-01小队在喀什巢穴被发现；另有两只在MUV-LUV The Day After的西雅图防卫战中出现：一只被击退，另一只战斗中被S-11装置炸死。战斗中，它的庞大身躯使得它能承受战列舰的火力，使得它成为最难杀的种类。

Laser-Fort Class
This BETA appears in the ending of Muv-Luv
Total Eclipse (VN). It is a BETA with various Laser-Class like "Eyes"
extended on a Fort Class body. Latrova, Inia, Yuuya, and the rest are sent to
take down the Laser-Fort Class, which was attempting to shoot down the Susanoo
and his escorts.
光线要塞级
这只在MUV-LUV ATE的结尾出现，它是一只有着光线级的眼睛和要塞级身体的BETA。拉托洛娃、伊妮娅、勇哉和其他人被派去干掉它因为它要击落凄乃皇和凄乃皇的护卫队。

The Creator
The sentient, silicon-based species which
created the BETA, the Creators (创造主/souzoushu) are technically not part of the BETA, and are regarded
by the BETA as the only possible state of life able to exist in the universe.
It is unknown as to whether this species still exists or not, as the Superior
gives no time reference to the creation of the BETA. It also states that they
are not in direct contact with The Creator, so it is possible that this species
is now extinct, leaving their creations to mindlessly wander the cosmos.
创造主
一种创造了BETA的有智能的硅基生命体。创造主不是BETA的一种，而是被BETA认为是宇宙中唯一的生命体。它是不是存在还是未知数，因为上位存在没有给出BETA是被创造的证据，创造主也不与BETA直接联系。创造主可能已经灭绝，留下他们的创造物没有意识的流浪在宇宙中。

Combat Doctrine
As an alien force created for mining, the
BETA center their strategies around total dominance with overwhelming numbers;
the areas that they take are eventually mined of all possible resources,
leaving a barren wasteland behind that is unfit for supporting human life for
decades to come.
What allows them to not just stand toe-to-toe
with humanity's forces, but to actually dominate them, however, are the
Laser-class and Heavy Laser-class BETA. Their lasers can instantly destroy both
air and ground enemy units from beyond visual ranges, and due to the fact that
a typical low-threat BETA encounter would usually number several dozen
Grappler-, Tank-, and Destroyer-class means that without air support, human
armies would typically find themselves outmatched and outnumbered in a ground
war.
In addition, there is no real way to detect
a BETA offensive from far off; ground-based sonic sensors and recon satellites
are at the mercy of the weather and mechanical failure. The best defence is to
have pilots being able to respond quickly and effeciently to a sudden
incursion, and to quickly deal with an incoming force if it is detected early
enough. During an offensive push by the BETA, expect to see several hundred to
tens of thousands of Tank-, Grappler- and Destroyer-class, as well several
Fort-class and dozens if not hundreds of Laser/Heavy-Laser-class BETA in the
mix as well.
The BETA are usually commanded by the
Superior, a BETA strain best described as a "biological quantum
computer". This is the one true threat to victory in any engagement; the
BETA in general can be lured into traps or defeated with clever use of tactics,
but when led by a Superior, the BETA become noticably smarter, to the extent
where it understands the concepts of human tactics and will create ways to
counter them.
Some basic tactics used by the BETA include
tunneling from underground, often surprising defending forces from the rear, or
from another front, creating opportunities for overconfident pilots to get
trapped in a pincer maneuver. Often the main issue with combating BETA in any
prolonged engagement is the threat of running out of ammunition, and the
massive numerical odds; close-quarters combat is viable, but that would be
playing into the BETA's area of strength, and is not encouraged unless as a
last-ditch measure.
BETA force size organization, as is
expected of their force composition, is several times higher than their human
counterparts. To add to that, most major engagments take place with multiple
corps-sized formations deployed by the BETA, as is their nature to rely on
overwhelming numbers.
战斗教导
作为生产出来采矿的外星军队，BETA把战略集中在惊人的数量优势上；它们占领的地区所有的可能的资源被采集一空，留下的废弃土地即使在十几年后人类也无法在上面生存。
是什么使得它们能不仅仅是与人类军队相匹敌而战胜人类呢？答案就是光线级和重光线级。它们的光束能精确的从视距外摧毁空中和地面目标，以及一支典型的危险的BETA军队总有大量的要击级、战车级和突击级，这意味着失去了空中支援，人类军队会发现他们在地面战争中被压倒。
另外，没有一种方法能从远处探测到BETA的进犯；地面声音探测器和侦察卫星受到天气和机械故障的影响。最好的方法是让士兵们能快速有效的对突发状况做出反应，如果够早的发现进犯的BETA就处理掉它们。在BETA的侵略中，常常看见成百上千只战车级、要击级、突击级还有几只要塞级和几十只光线级和重光线级组成混编队。
BETA通常由上位存在命令，BETA物种能描述为“生物量子电脑”。这是在遭遇战时的一个大威胁；一群无组织的BETA会落入陷阱或者被灵活的战术击败，但是如果由上位存在领导，BETA变得显著的聪明了，它们能理解人类的战术并且想办法对抗它。
一些BETA使用的基本战术包括在地下挖隧道——总是让防卫队吓一跳——和从另一边创造机会使过于自信的飞行员被包围。通常任何长时间的与BETA作战的威胁是用光弹药和敌我数量过于悬殊。近接格斗是可行的，但是这意味着游荡在BETA占优势的地方并且不被提倡除非是作为最后措施。
BETA军队的数量组织也就是军队架构，比起人类指挥官好上许多。需要补充的是，大多数大型遭遇战中BETA总是部署有数个军团的数量，反正它们的战术建立在数量上。

This chart, which showcases force
composition in a large-scale BETA attack force, is based on information from
the special episode of Total Eclipse.
这张图表显示了一个大型BETA攻击力量的组成，基于ATE的信息建立