I'd rather have something and not need it then try to find excuses not to bring a weapon with me on a combat sortie. Having it and not needing it is better than needing it and not having it. Maybe don't load expendables either since "what are the odds, right?" They don't weigh much at all or take up much space. At the very least, they will be more comfortable and proficient with their assigned firearms. Perhaps this can get merged into the newest "differences between Navy and Marines" thread.