Well wonder are those replies coming from old generation army

well okie to pass the swimming test in bmt... 50m breaststroke aka frog style is needed only. However a standard lap lah meaning ur breaststroke is proper.... one breath one stroke... not 2 breath 1 stroke...freestyle mix breast stroke etc etc all cannot.
Well if cannot pass den have to attend swimming lesson loh in swimming trunks... if u cant swim.. well how can they throw u all in water with army fatigue haha. Drown sia...
When u pass their swimming test.. there is no reason they will stop u from going ocs. However in ocs... i think u need to swim again but this time more laps....