. Air Force field jacket

Vintage Air Force field jacket…worn by fighter pilot in Viet Nam. 4 outer pockets…”US AIR FORCE” on left breast; “TACTICAL AIR COMMAND” patch on right breast. Drawstring inner waist. Approximate measurements: axilla to axilla 22”, length 31 1/2”. There is no size label; based on the person that wore this I believe this to most likely be a medium size. Another identical jacket of his does have a MEDIUM label.