1/51 Highland Volunteers (TA) Batallion Support Weapons Co/Bn HQ*
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The Territorial Army is Britain's volunteer reserve force, similar to say the USA National Guard. 
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My Territorial batallion was one of those ones that did not follow the normal TOE "rules " in the 70's.
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Instead of the normal rifle batallion's single mortar platoon of 6 tubes, we had 2 mortar platoons each of 4 tubes. And instead of the normal 6 land rovers with WOMBAT in a single AT platoon, we had 2 AT platoons of 4 each (London Scottish may have been towed MOBAT, but it is long ago and I cannot exactly recollect :-). 
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Our companies had originally been full batallions until the 1960's defence cuts, hence the differing cap badges contained in the one batallion. The Higland TA bns were numbered "x/51" as that was the old 51st Highland Division number. Similarly the Lowland Scottish TA bns were x/52 Lowland from the old 52nd Lowland Division number.
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We were a "Category A" formation, i.e. tasked for BAOR in wartime, where our main task was security of the BAOR rear area. Exercises therefore tended to involve say FRG Territorial Fallshirmjaeger playing the "Soviet desant troops" with operations being based on patrolling from dispersed company "hides" with helimobile transport often being used to relocate.
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At the time, 1st batallion, 51st Highland Volunteers was organised and based as follows:**
HQ Company (Perth) - Black Watch ("B" Echelon)*
A Company (Dundee) - Black Watch (+ mortar platoon)*
G Company (Stirling) - Black Watch (+ AT platoon)*
K Company (Kircaldy) - Black Watch (+ signals platoon)*
Liverpool Scottish (Liverpool) - Queens Own Higlanders (+ mortar platoon 2)*
London Scottish (London) - Own Design tartan (+ AT Platoon 2)
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I forget the 2 English based company's letter designators, but we really only ever saw them at annual training camp.
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So - 5 rifle companies when most batallions operated 3, although some were only 2 platoons strength (HQ company may have run a rifle platoon or 2 as well as the B vehicles), these were supposed to be brought up to war strength from reservists. 
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