Show health and height count every flying man in the united states air service has h as to undergo a strict medical test lierl periodically in order that ie he may be classified in one of four grades graces AA A Amen men are the few 06 who can stand air work at altitudes above feet A men can stand the strain between and feet while the nn B class consists of pilots for duties between between and feet and the arc C group includes all airmen fit only ar fr service between ground level and feet it has been found that airmen ot of most robust physique cannot stand the sudden changes of air pressure pressure sure entailed by diving and rapid climbing for any length ot of time mace the frequent medical examinations carried out experts who have drawn up a fully calculated standard of ef |