Formation 265, Formations 266 "Vasilek" it is classified as " Light AT-gun ".
I suggest to make a class "Mortar".
As it first of all a mortar.
For example, in artillery of a battalion there are mortars the battery, where 6 Mortars 2B14 "Podnos" and 3 Mortar 2B9 "Vasilek" (strukture MSD-92).
P.S.: MT-LB + 2B9 "Vasilek" used in Afgan war.
P.P.S.:
BMP-1 + 2B9 "Vasilek" Manual alteration + 5 pages Cool Photo Armour in Afgan War.