 This regimen was assimilated into the training of the British Army, which formed the Army Gymnastic Staff in 1860 and made sport an important part of military life.The term "boot" originates from U.S. Navy and Marine recruits in the Spanish–American War (1898) who wore leggings called boots; these recruits were trained in "boot" camps.Military-style training was used in the nineteenth century to rehabilitate civilian prisoners in the United States and for U.S. military prisoners during World War 2.