There have been interesting recent developments on the issue of proselytizing in war zones by American military personnel.  Recently a U.S. Marine stationed in Fallujah was re-assigned to another area, and reprimanded, for passing out coins imprinted with Bible verses written in Arabic.  In a similar story, a British police officer alledgedly told two Christian missionaries who were passing out leaflets in a largely Muslim area that they were committing a hate crime.  Follow the discussion at the Volokh Conspiracy.

Christian preachers alledgedly stopped from handing out leaflets in Muslim neighborhood in England -- Volokh Conspiracy

U.S. Marine re-assigned for distributing coins bearing Bible verses -- The Guardian (UK)

Missionary work in Iraq -- TIME

Missionaries' war for souls raises tension in Iraq -- The Age (Australia)

US Army of God?  General casts war in religious terms -- Commondreams.org