The Motorized Rifle Battalion (BMP)-
The squad= 9 men: 4xAK-74, 2xRPK-74, one RPG (also with Makarov), one Makarov (Driver). The maneuver team (dismounts) were seven. The driver and the gunner stayed with the BMP. The dismounts have no radio.
The platoon= Three squads and a platoon leader (Makarov) and asst PL (AK-74). Each BMP actually had two empty seats (they are designed to carry 9 dismounts max) and those are used by the PL and APL as required. One of the riflemen in the platoon is armed with an SVD instead of an AK-74. Some sources site that there is also a SA-7 in one of the platoon's BMPs with someone assigned and trained to use it. It is possile that the SAM gunner was actually attatched and simply rode in one of the empty seats. There is one portable radio in the platoon.
The company= Three BMP platoons and a company headquarters BMP with the CO (Makarov), XO/Political off (Makarvo), Senior Tech, (Makarov), First Sergeant (AK-74), BMP gunner (AK-74), and driver (Makarov). There was one, more powerful protable radio. The RTO came from the Battallion commo section and isn't part of the company. There were an additional two RPK-74s in the HQ track.
The Battalion= Three BMP companies. A Battalion HQ (one command BMP variant and a UAZ and GAZ truck, and various radios, and junk), Anti-Air platoon (3xBMPs with 3 SA-7's or SA-14s each), Auto grenade launcher platoon (3xBMPs with two AGS-17s each. Each BMP=weapons squad), Mortar battery (company sized unit with all the stuff a unit that size needs, 6 120mm mortars), Commo pla toon, medical aid station, supply platoon and a repari platoon.
While the Soviets didn't task organize as low a level as we did, they still knew combined arms was the way to go and did task organize. Leaving the two empty seats in each BMP is a pretty simple and effectvie way to be able to mix up troops at the squad level, which we generally don't think of them doing, which in itself is VERY interesting.
Ross
ETA: This info is directly from FM 100-2-3, The Soviet Army, troops organization and equipment.
If you want to learn about the Soviet Army and how it was organized, this is the manual on it. There are three manuals in the series, and pretty much covers everything you'd want to know about them. It doesn't have the actual order of battle as far as what unit is where, but does explain what each unit type is, what it can do, and how it does it.