Whilst we wait for Mike to reply, or the Omega to pull up I would like to relate the following incident. It occurred on climb out from Kabul. A Hercules crew were slowly gaining altitude when a TCAS RA event occurred.
The Herc was over mountainous terrain, the RA was a descend instruction. Just about the worst place to be on a dark night. Turns out, the new arrival plates for Bagram had not been deconflicted with the SID for Kabul. I relate this because I was under the impression that TCAS was mandatory for coalition aircraft. When I was flying over Afg in 2002, there were 2 AWACS aircraft North and South, with not so many aircraft to deconflict. I, myself had a near fatal airmiss because of a lack of TCAS on board. I was intrigued because XV235s MAYDAY call went unanswered. I hear that this is no longer the case (AWACS) and the sky is full of metal.
There have been very many RAs in this airspace. Just wondered if Nimrod had TCAS?