WASHINGTON — President Barack Obama will nominate Army Gen. David Rodriguez to succeed Gen. Carter Ham as commander of U.S. Africa Command and Marine Lt. Gen. John Paxton to succeed Gen. Joseph Dunford as assistant commandant of the Marine Corps, Defense Secretary Leon Panetta announced Thursday. Both appointments must be confirmed by the Senate. Rodriguez is the commander of U.S. Army Forces Command and has served in a “variety of key leadership roles on the battlefield,” Panetta said. He’s “a proven leader” who oversaw coalition and Afghan forces during the surge in Afghanistan, and “was the key architect of the...