Okay, why would someone come back to the base if they had intentions to kill more people? Wouldn’t this just draw more attention to their comings and goings? what would they come back for?
This is really starting to sound squirrely. The guy would have to be a ninja to do all that sneaking around killing in one night. Getting off and then back on base twice in one night without anyone seeing or hearing him. I don’t think you can just walk on and off those combat bases at will. Its not like Camp Pendleton or something.