In addition, the new Century Series of TAC fighters were making their first flights, designed from the lessons learned in the air over Korea. As these new fighters and new transport aircraft came on line, there were problems with each one. TAC pilots risked life and limb to iron out the problems and make these aircraft fully operational. Also, with the development of air refueling, TAC could now flex its muscles and demonstrate true global mobility. Deployments to Europe and the Far East became a way of life for TAC units. When Strategic Air Command abandoned its fighter escort force in 1957, those aircraft were transferred to TAC, further augmenting its strength.