Chinese warrior sisters sparring playfully in military uniforms

The Chinese sisterhood during the Second Sino-Japanese War period. A chinese woman in communist khaki army uniform older sister (pic 1) and a chinese woman in nationalist light blue army uniform little sister (Pic 2) with their tai chi shoes have straps (Pic 3) that fighting each other during the practice their martial art with hand-to-hand combat sparring by punching and kicking. They are playfulling.