See this infographic from Veterans United Home Loans on military rankings for the Army, Navy, Air Force, Coast Guard, and Marines.
RANK STRUCTURE AND INSIGNIA OF ENLISTED MILITARY PERSONNEL - ALL BRANCHES OF US MILITARY SERVICE
Military | WWII | US Army Unit Emblems | (http://en.wikipedia.org/wiki/Division_insignia_of_the_United_States_Army)
Google Image Result for http://www.battlefield-site.co.uk/britarmyranks.gif
The 35 Most Powerful Militaries in the World #infographic #Militaries #Weapons #infografía
Military Rank Chart - I know almost all of the Officer ranks/insignia now but this helps for enlisted!
Fullmetal Alchemist Military Ranks