'Halpro' (ii) was a US scheme devised by Lieutenant General Joseph W. Stilwell’s China-Burma-India Theater command for the bombing of Japan with Boeing B-29 Superfortress heavy bombers based logistically in India but operating tactically from forward airfields in China for the missions proper (1943/44).
This involved the establishment of the required airfields in China, and the delivery of vast tonnages of fuel and bombs to these airfields (often in B-29 machines which could not then participate in the raids proper).