 About thirty B-17s (B/D/E/F) served in the Caribbean and Antilles Air Commands during World War II, the first (B-17D 40-3058) arriving in Panama Canal Zone during March 1941.However, usually less ten were operational at any one time.They were mostly R- (Restricted from combat) RB-17Bs and Ds stationed at Río Hato Field, but some were at Albrook Field.