The military are asked to have contingency plans of all sorts. Wouldn't surprise me that 1) such plans were prepared, 2) there were also plans for invading England and, oh, I dunno, repelling an invasion from Mars.Exactly, so this is nothing.
The reason that we fought so well during the Persian Gulf war was because we had a plan repelling the Soviet invasion in the middle east.
All we had to do was to put the troops in place, and win the war decisively.
Plus, we were fighting the war we had been preparing for forty years to fight on the central plains of Europe, i.e., against Soviet doctrine and equipment.