10USC771 says:David said:The military can not stop someone from using insignia in advertising to my knowledge. You just can't say things like, "The men and women of PAXRVR NAS recommend BillyBob's Oil Service!", i.e. the federal government can not endorse any individual, company or product. I don't know if there are actual laws to prevent this, but you can well imagine what the people at BillyBob's competitors would do.... call the congressman and complain.
Except as otherwise provided by law, no person except a member of the Army, Navy, Air Force, or Marine Corps, as the case may be, may wear—
(1) the uniform, or a distinctive part of the uniform, of the Army, Navy, Air Force, or Marine Corps; or
(2) a uniform any part of which is similar to a distinctive part of the uniform of the Army, Navy, Air Force, or Marine Corps.
Distinctive part includes insignia.