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...
Bravo Squadron has finished 
clearing the 5th wave.
.انتهى سرب برافو من القضاء على الموجة الخامسة
Die B-Staffel hat die
Räumung der 5. Welle abgeschlossen.
Bravo acabó con la quinta oleada.
Bravo acabó con la quinta oleada.
Extermination de la vague 5
achevée.
La Compagnia Bravo ha finito
 di eliminare la quinta ondata.
O Esquadrão Bravo eliminou a 5ª onda.
Эскадрилья Б смела пятую волну.