Hal, veterans are not "the military," and using veterans does not in any way run afoul of Posse Commitatus.
Posse Commitatus is no longer the law.
Bush repealed it.
“A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.” ~George Washington
US Coast Guard 76-86 Semper Paratus