TCAS in the massively dynamic military environment (eg the environs of Cranwell's circuit) would be an amazing SA tool, but useless and possibly dangerous in RA. In the slightly more benign environment of civ CAS, airways etc for which it was really designed please please please follow the RA.We lost an aircraft at Uberlingen because our guys did and the other bunch didn't. The manoeuvre is simple, gentle and over very quickly and is there for when every other traffic separation method has failed for whatever reason.