32 C.F.R. § 705.35
(b) Basic criteria governing Armed Forces participation in public events have been developed by the Department of Defense to ensure compliance with public law, to assure equitable distribution of resources to as many appropriate events as possible, and to avoid excessive disruption of primary training and operational missions of the Military Services. the following general rules and information are included as an aid to you in understanding Department of Defense policies and in planning programs of mutual benefit to the Armed Forces and your community.
(2) Department of Defense participation and cooperation must not directly or indirectly:
(3) Participation by the Armed Forces in any event or activity may be authorized only if admission, seating and all other accommodations and facilities are available to all without regard to race, creed, color or national origin, and only if the sponsoring organization does not exclude any form of discrimination based on race, creed, color or national origin. This does not bar participation in events sponsored by nationally-recognized veteran's organizations when the program is oriented toward the veterans' interests, nor does it bar participation in non-public school events when the program is directed toward education or recruiting.