Last time in my recce course, we slept two hours a day. Middle of night backpack signal set and ran about in tekong forest for hours regularly, got men kena tekan to drank two litres water quickly also zero casuality. Made us walked under hot sun in full chemical defence suit, until one collapsed, then exercise cut, was that to test the human limit? The only injuries sustain by a few in the whole company are just sprained back that downgraded them. Those are not really training injuries but from doing cheap labours like building spectator stands.