Thailand had a reasonably well-trained military of 26,500 men, together with a reserve force which brought the army's numbers up to about 50,000. It also had an air force of some 270 aircraft, of which 150 were combat aircraft, many of them American. Japan had provided Thailand with 93 more modern aircraft in December 1940. The Thai navy was poorly trained and equipped, and had lost a substantial number of vessels in its conflict with French Indochina.