This is what I found about Chinese Army in WWII:
"Nonetheless, some 80,000 troops, in eight divisions, were trained to German standards and formed the elite of Chiang's army..."
"German-trained divisions were on par in terms of manpower with a western or Japanese division... From the moment German M35 helmets (standard issue for the Wehrmacht until late in the European theatre) rolled off the production lines in 1935, and until 1936, the NRA imported 315,000 of these helmets, each with the 12-star emblem of the ROC on the sides. Other helmets include the Adrian helmet, Brodie helmet and later M1 helmet."
"However, for most of the German-trained divisions, the standard firearms were German-made 7.92 mm Gewehr 98 and Karabiner 98k. However for those Chinese regular division their standard rifle are type 88 (copy of Gewehr 88 ) and Chiang Kai-Shek rifle (copy of Mauser Standard Modell)."
"...Chiang's army received $250 million worth of tanks, trucks, and aircraft from the Soviet Union in 1938, plus some British and French military supplies. Nevertheless, by the summer of 1939 Japan controlled most of northeastern China and all major coastal seaports, except for the British Crown Colony at Hong Kong. In short, China was isolated except for supplies moving from the west along the so-called Burma Road or through French Indochina."
"President Roosevelt approved $25 million in military aid to China on 19 December 1940, permitting the Chinese to purchase one hundred P 40 pursuit aircraft... about one hundred U.S. civilian volunteers to fly the one hundred recently purchased P-40s. These "Flying Tigers" began arriving in Burma in late 1941..."
"The United States confronted two fundamental challenges in the China theater. The first challenge was political...some Chinese were supporters of the Nationalist Kuomintang government ... and some supported the Communists... The second challenge in the China theater was logistical. the U.S. military could not sustain the logistics effort required to build a modern Chinese army. Without sufficient arms, ammunition, and equipment, let alone doctrine and leadership training, the Chinese Nationalist Army was incapable of driving out the Japanese invaders. ...The China theater was also the most remote from the United States. American supplies and equipment had to endure long sea passages to India for transshipment to China, primarily by airlift. But transports bringing supplies to China had to fly over the Himalayas..."
"Overall, the Nationalist Army impressed most Western military observers as more reminiscent of a nineteenth- than a twentieth-century army."
in China Defensive