An Iraq War veteran who was convicted of manslaughter for slaying a civilian — and was then busted on Monday for assaulting officers in the Jan. 6 Capitol riot — has federal prosecutors concerned he might “snap” again after they found a AR-15 rifle and 73 rounds of ammo in his closet. “The government is concerned that, under growing pressure, he may snap again,” Politico first reported, citing a 19-page motion to detain Richmond filed by Assistant U.S. Attorney Victoria Sheets. On Monday morning, Edward Richmond Jr., 40, from Geismar, Louisiana, was brought into custody in Baton Rouge after …