On April 19th, 1973, a race of extra-terrestrial lifeforms launched a landing unit from the moon, which touched down on Earth, in central Asia. Ever since, mankind has been engaged in a losing war against this alien species, known as the BETA, as they have gradually expanded outwards across the globe. After 20 years of non-stop fighting, the war has reached the shores of Japan...
All units, weapons free. 
Let's quiet these little piggies down!
!إلى جميع الوحدات، أطلقوا النار! فلنقضِ على تلك الخنازير
Alle Einheiten, Waffen frei.
Et ce, par tous les moyens !
Réduisez ces sangliers au silence !
A tutte le unità, sfoderate le armi. 
 Cuociamo alla brace questi maiali!
Todas as unidades, uso de armas liberado!
Acabem com esses porquinhos!
Пользуйтесь любым оружием.