What is the difference between a Green and a Red U.S. Senate ID Card/Badge?
Typically in DC government buildings, a green badge means no escort is required. A red badge means the person must be escorted around the facility. Usually, visitors with a green badge need to send their background information to the government agency prior to arrival. For secure facilities, all visitors need to send their background info ahead of time and only those with a security clearance are granted green badges. Sources: It is my opinion.