114 Factors limiting the number of trained men which can be made available for the armed forces at the outbreak of war. 7. The U.S.A. is now the only foreign country of importance dealt with in this paper which has not adopted or re-adopted conscription, so that practically the whole man-power of a nation from about the age of 20 upwards can be regarded as trained to arms, except in the case of the U.S.A., and certain "ex-enemy" countries which have only recently re-adopted the conscript system. 8.