Your Gun
Every person who was assigned a gun during their service knows that it is practically a body part. Wherever they go, their gun goes as well. This even means that when they have finished their service, they still have the feeling that their gun is with them.
Losing Your Gun
Speaking of that feeling like your gun is still with you – ex-soldiers actually sometimes have dreams of losing their gun (more like nightmares really) but they wake up and realize that they no longer carry a gun.