Washington legend Darrell Green tells TMZ Sports ... there should be only one route Dan Snyder takes when it comes to renaming his NFL franchise -- and that's to go with the "Red Tails" moniker.
"I would say that would be my first and only choice right now," the Hall of Fame cornerback says.
Of course, the Red Tails was the nickname given to the Tuskegee Airmen, a group of African American pilots who fought in World War II with planes that had red paint on the tails.
Green says it would be an amazing move on Snyder's part to call his team that .