This is unacceptable coming from anyone, let alone an active duty serviceman.
His original post, from his current FB page:
9/11 has officially been declared grandparents day by the whitehouse. Somebody please fucking kill obama
And some of his replies to those trying to talk him down:
Yager, how about you go kill yourself annd stay the fuck off my posts. Sweet thanks
If you'd like ricky you can come to mountain warfare school and see if the physical and mental stress you undergo isn't enough to make you snap at a few silly things. Sound fair?
Doesn't this constitute some violation of the UCMJ? He ought to be drummed out of the service after what happened at Ft. Hood, and the all-to-recent history of right wing violence in this country.