ations ▁were ▁for ▁tw in - engine ▁medium ▁land based ▁bom bers ▁only . ▁Am ph ib ian ▁medium ▁se ap lan es ▁like ▁the ▁P BY - 5 A ▁were ▁in ▁the ▁AM ▁category . ▁February ▁ 1 9 5 0 : ▁V P - ML - 5 5 ▁was ▁red es ign ated ▁V P - 7 3 1 ▁during ▁the ▁re organ ization ▁of ▁Naval ▁A viation ▁reserve ▁units ▁in ▁ 1 9 4 9 , ▁but ▁did ▁not ▁take ▁effect ▁until ▁February ▁ 1 9 5 0 . ▁During ▁this ▁period ▁the ▁number ▁of ▁Naval ▁A viation ▁Reserve ▁squad rons ▁was ▁reduced ▁from ▁the ▁ 1 9 4 9 ▁total ▁of ▁ 2 4 ▁to ▁ 9 . ▁By ▁this ▁date ▁the ▁squad ron ▁had ▁transition ed ▁to ▁the ▁P B M - 5 ▁Mar iner . ▁ 2 9 ▁September ▁ 1 9 5 0 : ▁V P - 7 3 1 ▁was ▁called ▁to ▁active ▁duty ▁due ▁to ▁the ▁out break ▁of ▁the ▁Korean ▁War . ▁The ▁squad ron ▁reported ▁for ▁duty ▁to ▁Commander ▁Naval ▁Air ▁Force ▁Pacific ▁Fle et ▁at ▁NAS ▁San ▁Diego , ▁Cal if . ▁At ▁the ▁start ▁of ▁host ilities ▁Navy ▁pat rol ▁forces ▁on ▁active ▁duty ▁number ed ▁just ▁ 2 0 ▁squad rons ▁and ▁it ▁quickly ▁became ▁apparent ▁that ▁this ▁rather ▁me ager ▁figure ▁was ▁in ade qu ate ▁to ▁meet ▁the ▁increased ▁dem ands . ▁By ▁the ▁end ▁of ▁ 1 9 5 0 ▁seven ▁reserve ▁pat rol ▁squad rons