This is the million dollar question and one in which sinkies are too stupid to ask. In fact, the only military training that SAF needs to do is urban warfare training, and how to fight Stalingrad style. How to turn every HDB block into fortified stronghold, how to set up ambushes from HDB blocks, how to channel enemy columns down one of the highways and whack them, practicing moving reinforcements rapidly from MRT station to MRT station, etc. U don't see any of this training. Which means to say MINDEATH does not anticipate sinkies fighting on home soil at all. Then why need an SAF?