Looks like the Yakima senior corps.
Correct color/style of uniforms, drums are the same, helmets same…
1930s or ’40s?
Yakima AL Post #36 Junior Drum & Bugle Corps
The following is the Junior Champion Bugler trophy from the 1939 Washington State Convention won by John E. Pfaff of the American Legion Post #36 Jr D&BC, Yakima Washington.