U.S. Secretary of Defense James Mattis, Cindy McCain, widow of U.S. Sen. John McCain (R-AZ), and other family members watch Sen. McCain's casket being transfered to a hearse upon its arrival at Joint Base Andrews August 30, 2018 in Maryland. The late senator who died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer, has been returned to Washington one final time. He will lie in state at the U.S. Capitol on Friday, then a memorial service will be held at the Washington National Cathedral on Saturday. Sen. McCain will be buried at his final resting place at the U.S. Naval Academy on Sunday.