On 13-Jan-2007, Bob Noel wrote:

The FAA doesn't have any say wrt airworthiness certifiation of US military
aircraft (any FAA certification of military aircraft is at the option of
the
service).

I'll add to this, when I was a comm-nav avionics specialist in the USAF
(1980-1991), we didn't have any kind of requirement to recertify the
aircraft transponders every two years. We fixed 'em when the crews said they
were broken but never worked on them otherwise.
Scott Wilson