I was playing Global Defence Force for the PS2 but sometime I felt something was off. There were times where I'd kill all the aliens in a level and an awkward silence would start before the end of the mission or the next wave of aliens.
I compared with video footage of the original japanese game "Chikyuu Boueigun 2" and of course the shitty localization is the cause.
Turns out the original game has voice acting during the levels and even the menus. While in the original your character gets information about what's going on from HQ or listens on the radio how another squad gets wiped out in the localized version the character just twiddles his/her thumbs doing nothing.