WASHINGTON - They are the Pentagon's new "rules of engagement" _ the diamond ring kind. U.S. Army chaplains are trying to teach troops how to pick the right spouse, through a program called "How To Avoid Marrying a Jerk." The matchmaking advice comes as military family life is being stressed by two tough wars. Defense Department records show more than 56,000 in the Army _ active, National Guard and Reserve _ have divorced since the campaign in Afghanistan started in 2001. Officials partly blame long and repeated deployments which started after the invasion of Iraq in 2003 and stretched the...