Retirees and veterans are not governed by the UCMJ. ONI pretending to be too dumb to know the law?
Did a little digging and found this...
Article 2(a)(4) allows for the court-martial of regular component (Army, Navy, Marine, Air Force, Space Force, and Coast Guard) retirees who are entitled to pay, and Article 2(a)(6) allows for the court-martial of retirees who are part of the Fleet Reserve or Fleet Marine Corps Reserve. Moreover, despite their retiree status, these two groups are treated like active-duty members in that they are continuously subject to UCMJ jurisdiction.
More items of interest at the link.