A housing intended to be arranged on a vehicle, in particular a military vehicle, and having a substantially parallelepiped shape including a front wall and a rear wall that each includes at least one bore for allowing air to flow inside the housing. At least one of the front or rear walls carries a plate, arranged outside the housing and at a distance from said wall, the housing further including at least one first slot allowing air to pass between the plate and the wall in question, and at least one second slot constituted by the gap between a lateral edge of the plate and said wall. The invention also concerns a weapon system including at least one missile launcher arranged in such a housing.