Frank uses alot of archaic US military unit designations especially with the aviation units. You'd have to figure out what the modern equivalents are. As far as the 173rd Recon Company goes, if you want a guess, when the modern irl 173rd Abn was formed from SETAF. One of its units was the 173rd Recon Company which eventually got redesignated the 74th Infantry Detachment (LRS).
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