In addition, Navy officers wear collar rank insignias on khaki uniform shirts like those of the corresponding Marine Corps grades. Description from brooksidepress.org. I searched for this on bing.com/images
RANK INSIGNIA OF NAVY COMMISSIONED AND WARRANT OFFICERS I always gets confused with the different ranks in the Navy.
Navy Customs and Traditions / Navy Rank Structure - Medical Officer's Guide to the Navy
navy rank structure chart for the canadian military
Google Image Result for http://www.officersguide.org/resources/Enlisted%2BRank%2BStructure.jpg
United States Military Rank Structure for the Air Force, Army, Marines, Navy, National Guard and Coast Guard Insignia - Military Rank
RANK STRUCTURE AND INSIGNIA OF ENLISTED MILITARY PERSONNEL - ALL BRANCHES OF US MILITARY SERVICE - web credit here - http://www.aviationexplorer.com/air_force_rank_structure.htm
RANK STRUCTURE AND INSIGNIA OF MILITARY OFFICERS - ALL BRANCHES OF US MILITARY SERVICE