The P Company mandate would have been a filter to erase 'badge collectors' for which there is a paranoia that remains extant. If you have a skill set that requires para insert within your portfolio being a P Company graduate is not necessarily a mandatory skill. Brown jobs cannot get into their grey matter that sometimes technical expertise far exceeds brawn. The list of such military skills would range from comms support to OP to battlefield photography etc etc and the 'best man for the job' may not have the youth or fitness to crack P Company, but that should not prevent him being the best man for the job. Happily in such cases single service direction is what it says on the tin.... Single service. There are plenty of other service types attached directly and indirectly to SF and 16 Air Assault.