A
21st Photographic Reconnaissance Squadron P-38 being serviced in Guangxi province, at either Liuzhou or Guilin.
Original can be found at National Archives and Records Administration.
Caption for the photo is:
Camera Repairmen Of The 21St Photographic Reconnaissance Sqd. Work On A
Lockheed F-5A Reconnaissance Plane In A Natural Revetment Formed By The
Limestone Buttes At A Forward Base In China. (Info thanks to TexLonghorn)