Actually in the RCN we were called the "executive branch', there were also 'engineering branch', pilots (back when we had a fleet air arm), paymasters, instructors, padres, medical branch and so forth. Each had its own coloured braid between the rank stripes. The RN later renamed their MARS equivalents Seaman Officers (and I guess later renamed them) but by then the CF had invented the MARS Classification. SO far as I know the MARS name has been around since the 1960s, Surface Warfare Officer (or Submarine Warfare Officers or maybe even Mine Warfare Officers) sounds OK to me, perhaps clearer and easier to understand than MARS to recruits.
In expressing what I did in the navy I also use the generic term Naval Officer to explain what I did to civilians. In fact however all of the above branches were naval officers.
This leads me to ask the question: What will hey call reserve BWKs? Reserve SWO, or just Mine Warfare Officers? Thoughts?