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Coast Artillery Organizational History, 1917-1950 Part I ...
RA - Regular Army RAR – Railway Artillery Reserve, AEF. Ry- Railway Sep- Separate. SL – Searchlight Type-A – 3-battalion regiment. Type-B – 2-battalion regiment Type-C – 4-battalion regiment. Type-D – 1-battalion regiment TD - Tractor-drawn. THD - Temporary harbor defenses WDC - Western Defense Command
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