In July 1945 the Pacific theater requested 25,000 shorter Garands for teh close-in jungle fighting that they were experiencing. Army Odrnance took the M1E5 action (an experimental M1 for paratroops that had an 18" barrel and a folding stock) and put it in a standard stock. The result was the T-26. The Ordnance Corps ordered 15,000 of them, but the order was cancelled in August of 1945 because of the end of the war. None were produced or issued. The only ones to exist were the very few prototypes fabed together by Ordnance.
Now open your mind to the way things happen in the Army.
At the same time (towards the end of the war) the Army also developed the T-26 tank. It later became the standard US tank, known as the M-26 Pershing, used in Korea. A handful were made and sent to the European theater where they did some good work and the rest is history as far as the tank goes. But remember the number..."T-26"
At the time the Army used a different numbering system for experimentla stuff. Rather than the "XM" of today, the Army used a "T" for technical model, or prototype, or what we would call experimental.
So as time passes, the true history of the T-26 rifle and the T-26 tank get blurred. People start confusing the "T-26" with the "T-26" and the "Tanker Garand" is born. It gains further status as a military urban myth since the T-26 rifle is shorter and would logically be better for use in the confines of the tank. Rumor, myth and BS what it is, and the result becomes that the Tanker Garand was made for tank crews.
The fact is it was made for the Pacific Theater, for the same reasons the XM-177 series was made for Vietnam. There was a need for a handier, shorter long arm. The "Tanker Garand" myth comes from the confusion of the experimental designation of the "T-26" and the "T-26".
Ross