Lab creates bio-engineered horrors to use as weapons. SEAL team assigned to train them. Training effective. Time for a mission.
How many stories have been written about some secret government experiment or Evil Corporation that creates a monster with intention of using it as a weapon? I'm fairly certain that in every one of those stories the monster turns on its creator(s) and must be destroyed. So, been there, done that.
Are scientists really as careless as that? If you're going to build a monster (and make a profit in the process) aren't you going to build in enough safeguards that the thing won't kill you in the test phase?
