From Samuel Keenan at the U.S. Army:
Military chaplains serve non-religious service members
“According to the Military Association of Atheists and Freethinkers, an advocacy group for nonreligious service members, there is an upward trend among military personnel who are deciding not to associate with any religious tradition.
In Massachusetts, that trend is evident with 49.5% of the state’s Army National Guard Soldiers choosing not to have any specific faith identified on their official record.
Even though they may not subscribe to the same religious tenets, service members can still rely on a network of professional military chaplains for assistance when it comes to their wellbeing.” Read more at the Army website.