The photographer and collector of the images in the Roubinek Collection in Yunnan province, China, during WWII. We know very little about this CBI veteran or the background of these images. See an overview here.
An image from the Roubinek Collection, showing planes and people connected to an American air base in WWII in Yunnan province, China, most likely around the Luliang air base area.
A Vultee BT-13 Valiant "trainer aircraft" with tail number 122455.