"Submachinegun making its own place within world armies " Topic

"Previously being the main firearm of law enforcement units, the submachinegun (SMG) has paved his way to the battlefield in the recent years. At present, the SMGs that retained the assault rifle layout are popular in almost all world`s armed forces. They are typically issued to special forces and combat crews.

Russia`s small arms manufacturers have embraced the modern requirements to this type of small arms and developed the Vityaz-SN SMG promoted on the global market by the Rosoboronexport company (a subsidiary of the Rostec state corporation). The PP-19-01 mod.20 Vityaz-SN SMG is designed to engage manpower (including the one wearing body armour) and soft-skin vehicles (cars, trucks, etc.). It fires various types of 9 x 19 mm cartridges. The firearm features a blowback operating scheme. Its trigger assembly allows firing in automatic and semi-automatic modes. The SMG is fed from a box magazine and features a folding skeleton buttstock. A sight can be installed on either upper Picatinny rail or side-mounted attaching lug ('dovetail'). Attaching lugs for a laser pointer, a flashlight or a tactical grip are installed in the lower part of a front-sight base. The SMG can be complemented by a removable silencer and a coupler for two magazines that increases a reloading speed…"
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Previously being the main firearm of law enforcement units

-- In Europe. In the US, law enforcement tends to favor shotguns.

It seems to that carbines are favored for crew?

Yes, most US LEOs use shot guns. Or if required AR-15 type weapons. The SMG was never in very much favored by most US LEOs.