This game is known for being insanely buggy - in fact, it's nigh unplayable, as it gives you broken passwords at the end of the levels, can randomly freeze anywhere, and sometimes - when you kill all enemies - you are unable to advance to the next level. Also, some options don't work, like tossing grenades into rooms before entering. It could be more buggy than Hoshi wo Miru Hito, and that's a serious "accomplishment".
As to the topic - it seems to be 'arrest/detain', judging from the context, but again, this option may not even work in game.
If it's not that, then the 'extraction' seems to be the best alternative. Maybe it happens at the end of each level (then it would make sense), though I guess you'd have to play it to check that out.