A few months ago, a DoD article highlighted the service of the North Carolina Baptist Men, a disaster relief group that also volunteers to assist local military exercises:

[The Baptist Men] call themselves the “disaster junkies”, assisting the Salvation Army and the American Red Cross by setting up mobile hospitals, showers, laundry services, child care facilities, and cooking stations that are capable of feeding 50,000 or more people a day.

For the National Guard’s Operation Panther exercise, the group was washing the troops’ laundry, as many as 120 loads per day.  The group is composed largely of retired military, and they even structure themselves like a military unit:  Read more