During WW1, the Royal Welsh Fusiliers were renowned for bull, even in the trenches. Robert Graves, a subaltern in the regiment, relates how his men complained about this, saying "they werent in the guards". His reply was that when they proved they could fight as well as the guards, he would ease off on kit inspections, etc. He went on to write that in fact regiments which took the most care about smartness and cleanliness tended to have the fewest cases of sickness, trench foot etc, and were generally more efficient fighting troops than their scruffy comrades.
Merely looking like someone in the SAS doesn't make you a good soldier.