Additionally, it's hard enough to coordinate air support without a bunch of wannabe Rambos running around out there not accountable to anyone and with no way to communicate.
Dude I can't tell you how many times I've watched/heard news or story's of shit ISIS has been doing. Sitting there pissed off and want to go over and get in the game. Than I rationalize and start looking at some key issues.
It's against the law to kill people in Iraq and Syria, at some point some court, some where, is going to start issuing warrants.
Technically the YPG is listed as terrorism linked organization, they are the main recruiter of western veterans.
How can you legally get good kit (body armor, weapons, NOD, blowout kit, etc) without violating ITAR?
Coordination between all the players, so you don't roll up some good guys, or get rolled up yourself, or as you pointed out, end up with some ordinance dropped on you.
Medical treatment, evacuation, post treatment, etc. Not to take anything away from the doctors and nurses of the middle east, but I've seen some of the shit they call "treatment" and its nothing I would trust.
If I had the POC to get over there and train these people, I would do I in a heartbeat, maybe with limited advisor role, but as for running off into battle with a 30+ year old AK47 and a prayer, nah, not my idea of a good life choice.