Piece of advice. If you're PES A, just get into a combat unit and vocation (eg. Infantry Rifleman, SISPEC, etc) and you will be surprised when your 2 years are up. Cos that's how fast time flies. No doubt that every single person in the military has a part to play, be it you're a storeman, a driver, a medic, a snare drum player in SAF MDC or a military police man. But, with all due respect to all vocations, if you're in a so-called "slack" job you will find that 2 years seems to take forever.
Trust me, i spent one year "chiong-ing" and another year slacking. No prizes for guessing which year seemed to end faster. All the best for your BMT bro.