Absolution (1997)

Decades after a meteorite destroys much of Earth life, survivor Ryan Murphy travels to a military base as a new recruit. However, he's really an agent investigating strange occurrences at the compound, which is ruled by the unforgiving Sgt. Bradley. As Murphy trains alongside his fellow recruits and secretly looks into the disappearance of a friend, he uncovers a shocking secret that may change the fate of humankind.