104th Fighter Squadron

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104th Fighter Squadron
A-10C Thunderbolt IIs of the 104th FS, 2008
Active	29 June 1921 – 18 October 1942 1 March 1943 – 1 May 1944 17 August 1946 – present
Country	United States
Allegiance	Maryland
Branch	Air National Guard
Type	Squadron
Role	Ground Attack
Part of	Maryland Air National Guard
Garrison/HQ	Warfield Air National Guard Base, Middle River, Maryland
Nickname(s)	Fightin' O's[1]
Equipment	A-10C Thunderbolt II
Insignia
104th Fighter Squadron emblem
Squadron tail code	MD

The 104th Fighter Squadron (104th FS), nicknamed the Fightin' O's, is a unit of the Maryland Air National Guard 175th Wing stationed at Warfield Air National Guard Base, Middle River, Maryland. The 104th is equipped with the Fairchild Republic A-10C Thunderbolt II.

The squadron is a descendant organization of the 104th Squadron (Observation), which was formed on 29 June 1921. It is one of the 29 original National Guard Observation Squadrons of the United States Army National Guard formed before World War II and is the oldest unit of the Maryland Air National Guard.