Those look like US military rank insignia. You can see a 1st. Seargent and a SSgt (Staff Seargent).
My guess is the Korean War, 1950-1953
This looks like late 40s I can tell by the M.P. paint style they changed them in 52 to a more minimal size lettering and getting rid of the white line below the text
when and where did that take place and why?
Those look like US military rank insignia. You can see a 1st. Seargent and a SSgt (Staff Seargent).
My guess is the Korean War, 1950-1953
This looks like late 40s I can tell by the M.P. paint style they changed them in 52 to a more minimal size lettering and getting rid of the white line below the text