Since the advent of their pioneering activism, which spanned the 1960s, many books have been written to commemorate their successes, but the first one that was published in 1964 by one of their few adult advisers was Howard Zinn's SNCC: The New Abolitionists.
Length of Vietnam War http://en.wikipedia.org/wiki/Vietnam_War According to wikipedia, it was fought for 11 years against France between 1946-1957 and 18 years against the U.S. between 1957-1975. Exact dates are sketchy.
Number of living veterans in 2013 who served during the Vietnam Era and both periods of the Gulf War (August 1990 to August 2001 and September 2001 or later). Other living veterans in 2013 who served during three wartime periods: 39,890 served during World War II, the Korean War and the Vietnam Era. Number of living veterans in 2013 who served during two wartime periods: 1,006,501 served during Gulf War (August 1990 to August 2001) and Gulf War (September 2001 or later).