The old Seiko aircrew chronograph was no longer provisioned mainly because the luminous (Tritium, good; Promethium, crap!) markings didn't meet current H&S standards, particularly in manufacture. The DEFSTAN that covered that watch was rapidly cancelled and never replaced. It's interesting that the specified time keeping was significantly better than that of the Pulsar (manufactured by Seiko).
If it's any consolation to the cost conscious, Aunty Betty paid nowhere near the price of those Seikos in Silvermans and the aviation shops.