On other convoys along those same roads, Marissa's husband, Specialist Charlie Bootes, manned a Mark-19 fully automatic grenade launcher.

NPR: Waiting and Dreading: Families in War Time

In the Uruzgan incident on Tuesday afternoon, Australian officials said an Afghan soldier fired on colleagues with an automatic weapon and a grenade launcher at a patrol base in the Charmestan region, north-east of Tarin Kot.

BBC: Afghanistan clash 'kills dozens of Taliban' in Paktika