if it hurts when you do militaries then its probably rotator and sadly i would abandon militaries. if it hurts then don't do it. i have the same thing in my right shoulder.. anything where i push straight up it sorta hurts, but if i do inclines i'm fine. so stick with inclines or do militaries very light .. when i go light on militaries its fine, just when i go heavy it sorta hurts.. now if i were to keep pounding away then the injury would get worse.