Most signatures on a flag

According to Official Guinness Records,

The most signatures collected on a flag is 115,405 and was achieved by the United Service Organizations (USO) with signatures obtained across the world from 1 April to 7 June 2014.

For a complete list of 2014 records, please visit 2014 Guinness Records in United States.

Other United States records that might interest you:

• Most tennis balls caught in a basket on the back in one minute
• Largest collection of Smurf memorabilia
• Most wins of the World Series of Bocce (female team)
• Largest s'more
• Fastest speed in an NHRA Drag Racing Pro Stock car race
• Fastest mile hopping
• Longest TV commercial
• Tallest cow ever
• Largest gathering of people wearing duck tape (duct tape)
• Most people carrying water jugs on their heads
• Most people applying sunscreen simultaneously
• Longest career as an ice-cream man
• Largest display of toothpick sculptures
• Longest marathon theatre performance
• Most live concerts headlined in 24 hours (multiple cities)
• Largest tonsils
• Longest videogame marathon playing a real-time strategy game
• Highest vehicle mileage