Army Staff Sgt. Ty Carter received the Medal of Honor this afternoon, a fitting tribute to a man who repeatedly braved enemy fire in Afghanistan while defending Combat Outpost Keating from a fierce Taliban attack in 2009. Before serving in the Army, however, Carter served as a Marine — and overcame a significant family tragedy. According to Carter’s hometown newspaper in Spokane, Wash., the newest Medal of Honor recipient’s brother was killed by a drunken friend playing with a shotgun at a party in 2000. Carter was a 20-year-old Marine serving in Okinawa, Japan, at the time: The brothers grew…