- "Look, you wanted to believe that the Army had straightened me out. Look, I'm your brother, but I'm not built like you. I didn't take to the military like you did. You saw the world as something to be fixed. I only saw it as broken, so I made sure I had enough to survive in it."
- —Andy Diggle to John Diggle[src]
The United States Army is the army of the United States of America.
In 2010, the Alpha-Omega super-virus eventually got the attention of the United States Army. After a debrief with Oliver Queen, the Alpha-Omega bio weapons problem became a United States Army operation. General Matthew Shrieve removed Amanda Waller's authority as the leader of A.R.G.U.S. for conducting an unauthorized operation without authorization from the United States government, and for committing unspeakable acts.
- General Matthew Shrieve (deceased)
- Lieutenant General Ulysses S. Grant, Union Army (Ret)
- Colonel Ted Gaynor (deceased)
- Lieutenant Joyner (incarcerated)
- First Sergeant Floyd Lawton (retired)
- Lieutenant General J.G. Walker (incarcerated; theft of a weapon of mass destruction, the murder of an enlisted soldier and try to frame John Diggle for his crimes)
- Sergeant First Class Rock (deceased)
- Sergeant Andy Diggle (deceased)
- Sergeant Bette Sans Souci (deceased)
- Private First Class James Jackson (deceased)
- Lyla Michaels (reassigned to A.R.G.U.S.)
- Ezra Barnes (incarcerated)
- Shadowspire Special Forces Unit (gone rogue)
- Baron Reiter (deceased)
- Conklin (deceased)