Short Showers
Long and luxurious showers are not really a thing in the military. Showers are often quick and are done out of pure necessity and nothing else. Soldiers actually take this habit of getting in and out of the shower quickly with them even when they are back to civilian life.
Sunglasses
Whether you are still soldier or you were one in the past, wearing sunglasses is just something you are comfortable doing. So, your sunnies are a must-have whether the sun is shining or not.