Here is a Wikipedia link
https://en.wikipedia.org/wiki/256th_...(United_States)
E Troop was part of the 256th till 9/1996 when it was reflagged as A Troop, 108th Cavalry Rgt, 256th Brigade. Historically, the 256th had an organic cavalry Troop assigned for recon beginning since at least the 1970s. During the latest Brigade Combat Team reorganizations, the recon element was reflagged and reorganized as the 2nd Squadron, 108th Cavalry Regiment.
I've assumed that during the run-up to the Twilight War, the unit reflagging in 1996 never occurred. However, no matter what, I don't believe that the unit would have disappeared from the ORBAT with wars going on and mobilization essentially in progress. I have been back and forth to call it the E Troop, 108th Cavalry Rgt, 256th Brigade, since the 108th was historically the parent regiment, at least till the 1920s. However, the 108th Cavalry squadron designations were more traditionally tied to the Georgia NG, at least from the 1920s.
After the embarrassment of Desert Storm, unit training was stepped up. I know they had M2s and M1s by 1990, and I am fairly certain as a roundout brigade it had M1A1s and M2A1s by 1990 and Desert Storm. Historically, I am certain that if they did not have these variants, that after the 5th Div was disbanded in 1992, the 256th received M1A1s and M2A1s during the draw down and reorganization, so historically by 1996 the unit would have had M1A1s and M2A1s regardless of which timeline used.