From the National Archives’ Record Group 306 (The Records of the United States Information Agency), this footage was found in a collection called “Library Stock Shots”. Apparently no logging exists of the thousands of rolls in this collection. It includes pre-war footage of various domestic U.S. scenes, inherited from the wartime “Office of War Information”, as well as wartime footage from multiple sources, including the U.S. Armed Forces, Germany, Japan, the Soviet Union and Italy. These rolls may exist in multiple other collections and archives, but without detailed description, locating imagery is a matter of hard work, and sometimes, serendipity!
This particular roll contains footage of the “American Volunteer Group” operating out of Kunming, China. Note the distinctive “tiger teeth” livery on the aircraft and the lack of U.S. emblems on the uniforms of the volunteers. After the attack on Pearl Harbor, the volunteers were folded back into the U.S. Army Air Forces, becoming known as the 23rd Fighter Group. Their commander, Capt. Claire Chennault, appears in the film.