intensified when Major John J. Murdock, Jr., took over the position of division flying safety officer. Tunner also altered the personnel rotation policy of the ICD, which he saw as a major contributor to crew fatigue. Before Tunner took command, a pilot's tour was completed after 650 flight hours over the Hump and he rotated back to the United States. Many pilots took advantage of this by flying daily, accumulating the required hours as little as four months. But these pilots overworked themselves; the division flight surgeon reported that half of all crewmen suffered from operational fatigue. So effective 1 March 1945, Tunner increased the number of flight hours required to 750, and required all personnel to be in theater twelve months to be eligible for rotation, which discouraged over-scheduling. Under Tunner, the India-China Division expanded to four wings in December 1944. The expansion was necessary to control the multiplicity of USAAF Base Units created as more airfields were opened. In addition to the Assam and India Wings, ICD added the Bengal Wing, headquartered at Tezgaon, to control C-54 operations, and the China Wing at Kunming. Tunner shifted his veteran commanders to provide leadership to the new wings. Cannon switched to the Bengal Wing, while Col. Richard F. Bromiley moved from the India Wing to the China Wing. Col. George D. "Lonnie" Campbell, Jr. succeeded to command of the Assam Wing. Both the accident rate and the raw number of accidents decreased notably as a result of these measures with the exception of the C-87/C-109 types, which remained 500% higher than on the C-54. Tunner called for their replacement entirely by C-54s and plans were drawn up to increase the Skymaster force to 272 by October 1945 and 540 by April 1946. With a fleet of 410 C-46s augmenting the ICD, the tonnage lift capability over the Hump was predicted to become more than 86,000 tons per month. A shortage of C-54 engines hampered the plan, which was modified to have a quarter of the force always in a pipeline between India and Florida for engine changes, carrying cargo and passengers as they traveled in both directions. The modified plan was approved in April 1945 and Morrison Field, Florida, was chosen for the maintenance but it proved an impediment to success when C-54s sent there remained at the field for periods five times the seven days originally estimated for turnaround.