by JOSIAH BUNTING 213 pages. Braziller. $5.95.
The Lionheads is a valuable oddity a small, intelligent Viet Nam book written by a career officer who in another time, another war, would be bending his disciplined mind to winning his stars. Instead, Josiah Bunting, a 32-year-old infantry major, has drawn up a novel really a sort of fictionalized indictmentwith the same shrewd logic he used to devote to planning operations in the Mekong Delta. The novel's interest, and the author's impulse, is not so much fictional as political. Because the author gives expert testimony, The Lionheads is a notable document of war.