Because of the death of President Jimmy Carter, the Flag may, for the first time ever during an Inauguration of a future President, be at half-mast.
https://duckduckgo.com/?q=Because%20of%20the%20death%20of%20President%20Jimmy%20Carter%2C%20the%20Flag%20may%2C%20for%20the%20first%20time%20ever%20during%20an%20Inauguration%20of%20a%20future%20President%2C%20be%20at%20half-mast.&ko=-1&ia=web