HADITHA, Iraq - They stormed the insurgent-ridden city of Fallujah, returned home, and now are back in Iraq's most troubled province — all in 10 months time. Some prefer this hectic pace. "I didn't join the Marine Corps just to stand around," said Lance Cpl. Giovanni Perez of Los Angeles. But for others, the demands of the overstretched U.S. military are just too much, regardless of the bonuses being dangled before them to re-enlist. "I get out of the Marine Corps in seven months and I can't wait," Cpl. Daniel Trigg of Olympia, Wash., said while guarding a mosque where...