The photos were allegedly taken last fall, before the 266th Military Police Company of the Virginia Army National Guard shipped out to Iraq in December.
Lt. Col. Christopher Garver said Friday the Army is conducting a criminal investigation and that no charges have been filed.
Fort Dix spokeswoman Carolee Nisbet says the allegations are disappointing. She said most soldiers who train at the New Jersey installation before being deployed "live up to the Army values."
The 266th is now serving in Basra.