Findings:

• Super Soaker CTF
• ctf (user)
• flagg (user)
• Black Flag
• flags
• flag burning amendment
• flag
• Capture the flag
• rainbow flag
• American flag
• flag day
• Flag burning
• white flag
• carry flag
• Water flag
• Pink Flag
• No Flag
• Flag down
• red flag
• freak flag
• hidden flag
• The Flag Of Italy
• Alaska's Flag
• Union Flag
• Randall Flagg (user)
• You can't eat a flag
• Canadian Flag Etiquette
• Flags and flag etiquette
• checkered flag
• yellow flag
• Green Flag
• Racing flags
• rebel flag
• beer flag
• Confederate Battle Flag
• The Bonnie Blue Flag
• The Confederate Battle Flag and the South Carolina Statehouse
• Post-It Flags
• Not the wind, not the flag
• The Red Flag
• bondage flag
• Six Flags
• Broken Flag
• Six Flags Darien Lake
• Flying the flag at half-mast
• newbie flag
• nautical flags
• The Blue Flag in the Bog
• Black Velvet Flag
• The American Flag
• The United States Flag Code
• Retirement and Destruction of the United States Flag
• Canadian Flag
• Flags of the world on your Rubik's Cube
• Randall Flagg
• fallen flag
• Flags of the Confederacy
• Laotian flag
• The Norwegian Flag
• The National Flag of Finland
• God Save the Flag
• The National Flag of Latvia
• Scottish Flag
• Six Flags Over Texas
• Red Flag Warning
• Wave That Flag
• That Ragged Old Flag
• How to fold and carry an American flag
• How to fold an Irish Flag
• The United States flag at half-staff
• Chequered Flag
• Blood Flag
• How to burn an American flag
• American flag etiquette
• The Furling of the Flags
• Six Flags America
• Hoover flag
• Swiss Flag
• Fannie Flagg
• Capture the Flag with Stuff
• A New Flag
• How the American flag got raped
• Why it is acceptable - even patriotic - to burn an American flag
• The Army Flag and Its Streamers
• Intel flags register
• The Aggressor Squadrons and Red Flag
• A Brief Defense of the Confederate Flag
• Flag of convenience
• Red Flag Linux
• new Gadsden Flag
• No more flags and footprints
• Remnants of the confederate battle flag in current state flags
• flag runner
• Blue Flag
• South Korean Flag
• Raising the Flag on Iwo Jima
• Ashes of American Flags
• Eureka flag
• The French flag
• prayer flag
• flag stop
• Days to display the American flag
• flag officer
• Six Flags Great America
• USS Flagg
• Six Flags Astroworld
• Six Flags Worlds of Adventure
• Palestinian flag
• Brazilian flag
• Black Flags
• Ceremony of the Flags
• false flag operation
• NX (Non Executable flag)
• Broadcast flag
• Minesweeper Flags
• Flag state
• American Flag Lapel Pin
• Six Flags Magic Mountain
• the flags are all dead at the tops of their poles
• Palmetto flag
• Pilot flag
• Flag Dancing
• Every normal man must be tempted at times to spit on his hands, hoist the black flag, and start slitting throats
• Six Flags Over Georgia
• Green flag lotto (user)
• sweet flag
• The Rican Flag (user)
• The People's Flag is Palest Pink
• International Maritime Signal Flags hanging in front of the Krusty Krab
• Flags of the World: A Style Guide
• Stolen Flags of the World: A Larceny Guide
• "enough praying, let's burn the flags!"
• Flag of Saint George
• American Flagg
• rally around the flag
• Ball, Flag, Tree
• Electric Flag
• Fascist Tactics: False Flags and Infiltrator Excitement
• Was the Alexandria baseball shooting a Trump False Flag?
• Was the Parkland shooting a Trump False Flag?
• A Little Black Flag
• All black American flag
• Pirate flag
• Obsequious One (user)
• Anonymous One (user)
• One
• One Crazy Summer
• Great Old Ones
• one of the lost
• Infinity plus one
• square one
• one armed bandit
• Buy one gallon of gas at a time
• number one
• One Flew Over the Cuckoo's Nest
• One Nation
• One Ring
• ones
• Tie one on
• Channel One
• that one
• To boldly go where no one has gone before
• One Microsoft Way
• One Love
• One Node to Rule Them All
• Trust No One
• Pepsi One
• The Young Ones
• One Lap of America
• One-Winged Angel
• Dry bones can harm no one
• in a sanctuary of geeks, not one solution

If you Log in you could create a "one flag CTF" node. If you don't already have an account, you can register here.