ColinB, you are quite incorrect in believing that the official religion of the realm is C of E. It is the established church in England only and as the Armed Services are British, not English, then all religions are represented in the chaplaincy. I know from experience that C of E, C of S, Baptist and RC all have full-time chaplains. I've never come across a Rabbi though and in my time there was no Moslem representation either, although that may have changed by now.