91 (Argyll & Sutherland Highlanders) Anti-Tank Regiment RA (TA) was converted from 5th Battalion The Argyll & Sutherland Highlanders in November 1941 with four batteries. In December 1944 they amalgamated with . 144 and 146 Batteries replaced two of 63rd’s batteries. The new Regiment dropped the Yeomanry title becoming 63 Anti-Tank Regiment. The 91 (Argyll & Sutherland Highlanders) Anti-Tank Regiment RA (TA) went into suspended animation in January 1945 and was disbanded in January 1947.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Nov 41 | Formed from 5th Battalion Argyll & Sutherland Highlanders | ||
| Nov 41 | Home Forces | UK | |
| Mar 44 |  |
2 Army | UK |
| Jun 44 |  |
8 Corps | NW Europe |
| Nov 44 | |
2 Army | NW Europe |
| Jan 45 | Suspended animation |
Batteries
| Nov 41 | A, B, C, D |
| Mar 42 | Q, R, S, T |
| Jul 42 | Q, R, S |
| Jan 43 | 144, 145, 146 |
| Jul 43 | 144, 145, 146, 344 |