A horse-drawn caisson carried the senator's casket from the academy's chapel to its cemetery, following a private service.
McCain's family, including his 106-year-old mother, Roberta, is escorting his remains to Annapolis on Sunday.
Duckworth first met McCain when he paid her a visit as she recovered from combat wounds at Walter Reed Army Medical Center.
McCain's funeral procession will pass the Vietnam Veterans Memorial, where his wife, Cindy, is expected to place a wreath.
Thousands of people lined up for blocks outside the U.S. Capitol Friday to say goodbye to John McCain.
With the passing of Sen. John McCain, we have lost a passionate evangelist for the power of public service.
The American Legion had criticized President Trump's response to the senator's passing.
NATO is considering a proposal to name the alliance's new Brussels headquarters after the late U.S. Sen. John McCain.
The private service at the Arizona Capitol marked the first appearance of McCain's family members since the senator died.
No matter one's political leanings, McCain was always a dynamic guest to watch.
The campaign of President Donald Trump released a letter from 235 retired senior officers backing his re-election.
The news comes four years after the Air Force laid out initial plans for what its future fighter jets might look like.
The recent exercises were one of many the Air Force is conducting to test its Advanced Battle Management System.
A veteran of the Marine Corps and Army National Guard, he went through boot camp more than four decades ago.
Cmdr. Robert Arias is at least the third Navy commander removed from his job in recent weeks.