FACTBOX-America's Vietnam War veterans

April 6 (Reuters) - U.S. Republican presidential candidate and Arizona Sen. John McCain was a Vietnam War veteran and former prisoner of war.

Following are some facts and figures about Vietnam veterans in the United States:

- The U.S. Department of Veterans Affairs says the Vietnam War (1964-1975) involved over 8.7 million U.S. service members worldwide. Over 3.4 million were deployed to Southeast Asia.

- The United States suffered around 58,000 battle or "in theater" deaths during the Vietnam War. Vietnam and neighboring countries like Cambodia and Laos suffered far higher death tolls, many of which were civilian.

- There are around 7.2 million U.S. Vietnam veterans still living.

- While several veterans of World War Two have been elected to the White House, the Vietnam conflict has yet to produce an American president.

- Many Vietnam veterans were draftees from lower-income backgrounds and a large number have experienced social and economic difficulties. By some estimates almost one in four homeless people in America are veterans. Of these, almost half are Vietnam veterans, according to the National Coalition for Homeless Veterans.

(Sources: United States Department of Veterans Affairs; National Coalition for Homeless Veterans)

(Compiled by Ed Stoddard; Editing by Eric Beech)