Colonel Irvine A Rendle, Group Commander of the 392nd Bomb Group instructs personnel of the group to adjust their watches for their 100th mission. Official caption on image: "51630 A.C." Printed caption on reverse: '51630 USAF- AN EIGHTH AIR FORCE LIBERATOR STATION, ENGLNAD. Col Irvine A Rendle of Rawlins Wyo, Liberator Group Commander, and Capt Harold F Weiland of Elyris, Ohio, Group Bombardier, give the Lib bombardiers a time "hack" for synchronization of their watches before going out on their 100th mission, the invasion of Europe. US AIR FORCEW PHOTO.' Handwritten caption on reverse: 'Group Co. Rendle giving bombardiers time check for mission.’