Last Flag FlyingThirty years after serving together in the Vietnam War, Larry "Doc" Shepherd, Sal Nealon and the Rev. Richard Mueller reunite for a different type of mission: to bury Doc's son, a young Marine killed in Iraq. Forgoing burial at Arlington National Cemetery, Doc and his old buddies take the casket on a bittersweet trip up the coast to New Hampshire. Along the way, the three men find themselves…