Military Sources

http://s1.hubimg.com/u/3772818_f520.jpg

http://www.officersguide.org/9.html

http://en.wikipedia.org/wiki/Devil_Dog

http://en.wikipedia.org/wiki/History_of_the_United_States_Air_Force

http://en.wikipedia.org/wiki/History_of_the_United_States_Army

http://en.wikipedia.org/wiki/History_of_the_United_States_Navy

http://en.wikipedia.org/wiki/History_of_the_United_States_Marine_Corps