BAGHDAD (CNN) -- The U.S. military announced the deaths of three U.S. military personnel killed this weekend, bringing the military's death toll for the month to 81 -- the highest this year.

A Multi-National Division - Baghdad Soldier died at approximately 1 p.m. Sunday after his patrol struck a roadside bomb in eastern Baghdad, the U.S. military said.

A Task Force Lightning Soldier died Saturday and three others were wounded in enemy action in Iraq's Salaheddin Province, according to a U.S. military release Sunday. The soldier was assigned to the 3rd Brigade Combat Team, 82nd Airborne Division. The U.S. military Sunday also announced a U.S. Marine, assigned to Regimental Combat Team 5, died Saturday "of injuries sustained from enemy action" in Anbar, the vast Sunni-dominated province west of Baghdad, the U.S. military said.

Three other Marines died Saturday in Anbar as a result of combat, but it is not clear if all four were killed in the same fighting. The highest monthly death toll this year had been in April, when 76 troops were killed.