Reasons why due to the overwhelming +Supports
100% would fit into RP. The fact that it is a British department really does not make a difference, It could easily be called ESU or ARU. Its really up to SMT to decide what role it would have in RP or an entirely made up branch could be made with the exact way to fit into RP as effectively as possible.
It doesnt matter if it was Valkyrie running it, he made a branch that was an absolute top notch prestige branch. No other branch on this server demonstrated that LEVEL of quality and prestige.
ARU could essentially replace the dead branches on the server CERT & NSA.
Ultimately there is no interaction between SWAT & SRT - No communication and no joint SOP's which really does throw off RP.
The TAC units that exists on the server at this point in time do not display the true quality of an effective branch. There is no RP with people running into the bank with no formations and ultimately pure mingery. Quite frankly only SWAT & ARU are the only branches that should exist with joint SOP for specific things that must be taken care of by each department. There is a HUGE lack of RP, it is static and boring. Things need to be changed to revive the aspects of fun but serious RP.