Prepare to be surprised. I have a photo of my son, which is beyond my technical ability to upload, armed with both a pistol and a shotgun. He was standing in front of his tank somewhere in Kuwait prior to their going to Iraq. He spent half of his time there in the fair city of Tal Afar but I don't think he had the shotgun with him then. They turned in their pistols (as useless) and had either M4s or M16s, plus their regular tank weapons. Don't know what happened to the shotgun.
I also have a photo somewhere of my father standing in front of one of those WWII bell tents wearing fatigues, a Daisy Mae hat and armed with a shotgun.
I don't remember if I ever saw a shotgun in my time in the army.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.