It is honorable to refuse to serve in some conditions.
http://desertpeace.blogspot.com/2007...a-victory.html
Victory for Iraq war refuser
Supporters of First Lt. Ehren Watada rejoiced over a federal judge’s injunction last week barring a new court-martial for the officer who refused to serve in Iraq. But they also urged stepped-up pressure to drop all charges and release Watada from the Army with an honorable discharge.
Watada is the first U.S. commissioned officer to publicly refuse to go to Iraq. Last year, after criticizing the Iraq war as an illegal occupation, he refused to deploy there with his Stryker Brigade. The Army rejected his offer to serve instead in Afghanistan.
Because he spoke out publicly against the Iraq war, the Army added the charge of conduct unbecoming an officer.
U.S. District Court Judge Benjamin Settle issued a temporary injunction barring a second court-martial. The judge said Watada would probably be successful in asserting that his Fifth Amendment rights would be violated by being tried twice for the same crime, otherwise known as double jeopardy.