The 2^nd Bombardment Squadron (“Avengers") of the 1^st Bombardment Group and the 28^th and 32^nd Fighter Squadrons of the 3^rd Fighter Group received movement orders on October 17, 1943, and became the Wing's first increment to move to China. They flew their planes over “the Hump”—the name given by Allied pilots to the eastern end of the Himalayan Mountains—to provide air support for Chiang Kai-shek's ground forces in accordance with Chennault's plan. The 2^nd Bomb Squadron’s six B-25s, under the command of Maj. Tom Foley, became the first CACW unit to reach China, arriving at Yangkai in South China on October 25, 1943.Hazardous conditions caused some of the 2^nd Bomb Squadron's B-25s to delay crossing until conditions improved. Within a few days of the first attempt, the next contingent of three bombers led by group commander Lt. Col. Irving L. ("Twig") Branch followed, and finally the remaining three

Following lengthy preparations to ready the base for Maj. Gen. Claire L. Chennault's visit, Chinese and American personnel celebrated the first anniversary of the Chinese-American Composite Wing on October 8, 1944, at Peishiyi (Baishiyi) in Szechuan Province. The ceremony included recognition of several members of the 3rd and 4th Bomb Squadrons for their heroism in aerial combat..

On August 26, 1944, members of the 3rd Bomb Squadron flew "the Hump" of the treacherous Himalayas, making the move from Chabua in Assam, India, to Kweilin (Guilin) in Kwangsi (Guangxi) Province, China. Flying the Hump took planes over rugged terrain, often through violent storms, sudden down drafts, and snow and ice at higher altitudes. It was some of the most dangerous flying in the world―so dangerous, in fact, that every flight over the Hump was logged as a combat mission. The planes all made it across safely, and squadron personnel arrived at their new base on September 1.