Working at night on shift is very tiring, time passes slowly and you need a meal break to break the monotony. If you had your last hot meal at 1800 prior to starting your shift and the only prospect is breakfast at 0700 then I can assure you after a week or so patience runs thin! Also between 0200 and 0500 your body clock wants to go to sleep, an uplift of sugar is required, mistakes can be made and whether you are in a rotary wing or fixed it can be fatal to the crew, and they expect the ground crew fit and able to do a good job. I am sure that the galley on a ship never shuts and the army always have equipment to make a hot meal. If you have never worked a night shift for an extended period, please don't slag people off for complaining about lack of hot food!