James, this was a short-lived organization tailored to provide a tailor-made operational maneuver group. The name was variously translated as "Independent" or "Unified" (which we preferred in the US) Army Corps. It did not replace conventional organizational structures, but was formed from existing assets. There were only two ever formed: one in the west, in the Byelorussian Military District; and one in the east, in the Transbaikal Military District.
Once we (in the west) knew about these, we watched them like hawks, thinking they were bellwethers for future force development. We couldn't really talk about them, as there was no open-source information on them for a while after their formation. But we got a great boon when the Conventional Forces in Europe (CFE) treaty required reporting all the organizations and their assets (major weapon systems which were treaty-limited equipment). We first received preliminary data in 1988; then we had some details we could tell the troops about. But by the time the CFE data was finalized concurrently with the treaty signing in 1990, the UACs had both ceased to exist, and all we had was a snapshot of history!
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The 5th Unified Guards Army Corps was located in Ureche, Belorussia. It was activated in 1984, based on the existing 120th Guards Motorized Rifle Division.
It comprised the following major units and subunits:
1st Separate Guards Tank Brigade
2nd Separate Guards Tank Brigade
176th Separate Guards Motorized Rifle Brigade
177th Separate Guards Motorized Rifle Brigade
310th Guards Artillery Regiment
1045th Guards Anti-Aircraft Missile Regiment
1180th Rocket Artillery Battalion
276th Independent Helicopter Squadron
1318th Independent Air Assault Battalion
[Note that this does not quite jibe with the 1st Unified Army Corps listed under the Byelorussian MD (at Minsk) in the OB at the link Norm cited; I'd have to go digging in my old notes to find when things changed: two tank brigades to three; arty regiment changing to a brigade; etc.]
The corps was disbanded in August 1989, and reverted back to the 120th Guards Motorized Rifle Division.
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The 48th Unified Guards Army Corps was located in Kyakhta, Transbaikal. It was activated 1984, primarily from the 5th Guards Tank Division.
It comprised:
3rd Separate Guards Tank Brigade
4th Separate Guards Tank Brigade
178th Separate Guards Motorized Rifle Brigade
179th Separate Guards Motorized Rifle Brigade
861st Artillery Regiment
940th Anti-Aircraft Missile Regiment
1181st Rocket Artillery Battalion
277th Independent Helicopter Squadron
1319th Independent Air Assault Battalion
The corps was disbanded in March 1988 [which is why it does not appear on the OB Norm cites], and reverted back to the 5th Guards Tank Division [which appears in the Far East MD (in Vladivostok) in that OB].
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There was a lot of confusion about these organizations, especially when it came to tracking the reorganization and redesignation of subordinate units. We thought for a while that the creation of tank and motorized rifle brigades in the UACs would herald a force-wide structural change, but it didn't happen. Again, to go into more detail, I'd have to go digging stuff out of storage!
Hope that helps.
Allen