"flak ships" . . . "submarine chasers" . "patrol boats (trawlers)" . "patrol boat" . . "vorpostenboot" . . "outpost boat" . . "Vorpostenboot" . . . . . . . . . "Vorpostenboot" . . . "patrol boats" . . "Flak Ship" . "KFK patrol vessel" . . . . . . "Flakships" . . . . . . . . . . . . . . "Flak ships" . "flak ship" . "ships" . . "V-Boats" . . . . . . .