By Rick Rogers UNION-TRIBUNE STAFF WRITER August 15, 2007 CAMP PENDLETON – Tens of thousands of American and Iraqi troops serve together daily, but last December a dispute while on duty led to a Marine reservist stabbing an Iraqi soldier to death as the two stood watch in Anbar province. Now Lance Cpl. Delano V. Holmes, 21, is accused of killing Mutather Jasem Muhammed Hassin inside a tiny observation post in Fallujah, according to charges filed by the Marine Corps. Holmes, an Indianapolis resident who was on his first deployment, was arraigned July 31 and is scheduled for court-martial at...