Harry served as an Apache helicopter pilot in 2012-13
The prince has been criticised for discussing killings in Spare, with some military figures saying it was wrong to refer to the dead as "chess pieces".
But on US TV, Harry accused the press of taking his words out of context, adding the spin endangered his family.
He also defended his remarks, saying he had wanted to reduce veteran suicide.
Spare, which was published on Tuesday, has become the fastest-selling non-fiction book ever in the UK.
Some 400,000 copies of the memoir have been bought, despite many excerpts being leaked in the press ahead of its official release.
-- Courtesy of BBC News