Ronald H. Specter’s list of Vietnam books (“ ‘What Did You Do in the War, Professor?’ ” December 1986) lacks one I consider the best of all— America in Vietnam , by Guenter Lewy (Oxford University Press, 1978). Lewy balances out some of the more ideological, left-slanted books like Frances FitzGerald’s, David Halberstam’s, and Douglas Pike’s.