Close began his National Service on 6 October 1949, in the Royal Corps of Signals at Catterick Army Training Depot. Another football injury, picked up during training, meant that he spent his first month of military service excused from duties. Once he was fit again, he was given weekend passes from the army to play football for Leeds. During one of these games he was badly injured again: playing against Newcastle United he hurt his thigh in a collision with Ted Robledo. Showing the stubbornness that he later became famous for, Close played the rest of the game, but by the time he reported back for duty the next day, it was badly swollen and painful. He was excused from duties again, but not offered any treatment by the army. After around six weeks, he travelled home on leave and got some heat treatment from the Leeds United physiotherapist, but there was little progress until just before Christmas, when another examination by the army revealed ossification of the thigh. Two months of treatment and bed rest followed, which Close thinks saved his career, he said that otherwise: "the injury would have finished me. I would never had bent my leg again."