A more complete list:
Soldier, Surgeon, Scholar: The Memoirs of William Henry Corbusier, 1844-1930
by William Henry Corbusier, Robert Wooster
The Dressing Station: A Surgeon's Chronicle of War and Medicine
by Jonathan Kaplan
Long Walk Through War: A Combat Doctor's Diary (Texas A&m University Military House Series, No 4)
by Klaus H. Huebner
Fighting for Life
by Albert E. Cowdrey
Cellars of Marcelcave: A Yank Doctor in the BEF
by Christopher J. Gallagher
There also exist few books about Nazi doctors... not exactly what you're looking for... but neverthless still very interesting to read, especially about how doctors, who are sworn not to do any harm, became agents of mass murders.