No. They carry the best weapon for the particular job and they are backed up by guys with M16's and MP5's and other weapons. Unlike you who can only functiion with the canned CAR, there are others among us who have expertise with multiple kinds of weapons.
Not to mention shotguns in military use are basically used as hand-held claymore mines. Do a lot of damage, if necessary do a little damage to several people, making them easier pickings for riflemen.
Shotguns are for close engagements, you know, like where the 11.5" CAR is good. They were used to devastating effect against the moros in the Philipines and inflicted such horrible casualties in WWI, that the Germans tried to have them banned under the Geneva Convention as being "unfair".
Personally, my social 870 stays in the bedroom, and my rifle in my vehicle. I prefer the shotgun for home for several reasons (1) the effect of the slide-racking noise in an enclosed area, (2) penetration issues, both under- and over- (3) wider dispersal. Yep, the slide noise has an effect outside too. Yep, shotgun loads can overpenetrate too. Yep, dispersal of shot will be minimal at in-home ranges. Yep, all these have been argued ad nauseum.
If you are of a certain age, you will be familiar with the words, or you may have posted with me on other forums. This sobriquet is not chosen just for it's literal translation, but as an attitude towards all who would be this nation's enemy. If you actually speak it, I envy you, for I have forgotten more than I have remembered, however, I recall some when I see it, or, more increasingly, hear a snatch of it.
On their chest's and some paratroopers had it on their forearms. It Literally mean "Kill Cong" (communists). I heard there was a big rush for tattoo changes and attempts at eradication in Saigon, 1975.