 The Soviet Navy used the term "guard-ship" ("сторожевой корабль").From the 1950s to the 1970s, the United States Navy commissioned ships classed as guided missile frigates (hull classification symbol DLG or DLGN, literally meaning guided missile destroyer leaders), which were actually anti-aircraft warfare cruisers built on destroyer-style hulls.These had one or two twin launchers per ship for the RIM-2 Terrier missile, upgraded to the RIM-67 Standard ER missile in the 1980s.