Last Updated Naval Submarine Force WC Codes 17 Mar 25 Naval Surface Force WC Codes 23 Jun 25 Naval Air Force Ship WC Codes 27 Nov 20 Naval Expeditionary Force WC Codes 01 Jun 20 Navy Installation Command WC Codes 31 Aug 20 Naval Information Force WC Codes 26 Jul 22 INDENTIFICATION AND ASSIGNMENT OF LEVEL I MATERIAL CERTIFYING ACTIVITY DESIGNATORS (In support of Vol V-I-6.3.6) NAVSEA ltr 4855 Ser 06/033 22 Apr 25