ated ▁squad rons ▁are ▁sometimes ▁incorrectly ▁referred ▁to ▁as ▁" de comm ission ed " ▁squad rons , ▁but ▁proper ▁usage ▁prior ▁to ▁ 1 9 9 8 , ▁was ▁that ▁squad rons ▁were ▁" est ab lished " ▁and ▁" dis est ab lished " ▁and ▁after ▁ 1 9 9 8 , ▁squad rons ▁are ▁" est ab lished ", ▁" de activ ated " ▁and ▁sometimes ▁" react iv ated ". ▁It ▁has ▁never ▁been ▁correct ▁to ▁refer ▁to ▁U . S . ▁Navy ▁aircraft ▁squad rons ▁as ▁being ▁" comm ission ed " ▁and ▁" de comm ission ed ", ▁ships ▁are ▁commission ed ▁and ▁de comm ission ed , ▁U . S . ▁Navy ▁aircraft ▁squad rons ▁are ▁not . ▁ ▁U . ▁S . ▁Navy ▁A ircraft ▁Squadron ▁Design ation ▁System ▁Track ing ▁the ▁history ▁and ▁line age ▁of ▁U . S . ▁Navy ▁aircraft ▁squad rons ▁can ▁be ▁difficult ▁because ▁of ▁the ▁system ▁of ▁design ating ▁squad rons ▁that ▁existed ▁prior ▁the ▁issu ance ▁of ▁Chief ▁of ▁Naval ▁Oper ations ▁Inst ruction ▁( OP NA V INST ) ▁ 5 0 3 0 . 4 E ▁dated ▁ 1 9 ▁March ▁ 1 9 9 8 . ▁Prior ▁to ▁that ▁instruction ; ▁when ▁dealing ▁with ▁a ▁squad ron ' s ▁line age , ▁the ▁only ▁correct ▁terms ▁to ▁use ▁were ▁" est ab lish ment ," ▁" dis est ab lish ment " ▁and ▁" re - design ation ." ▁Under ▁those ▁old ▁rules ▁( p