I also find that Dargue was killed in a plane crash on 12/10/41 near Bishop, California.
The National Aviation Hall of Fame website says that Dargue died on 12 December 1941. Several photos of Dargue can be found at
www.earlyaviators.com including the 1916 Mexico photo referenced above.
What is interesting about the Dargue crash is that the wreckage was found May 7, 1942 by Roy G.B. Burns, the father of the copilot. The airplane was found at the 11,000 foot elevation near Thumb Lake, California, about 15 miles southwest of Bishop, CA.
Men killed in the 12-12-41 crash:
Pilot: Captain James G. Leavitt
Copilot: 1stLt. Homer C. Burns
Engineer: SSgt. Stehpen W. Hoffman
Radio operator: Private Samuel J. Van Hamm
Passenger: Major General Hebert A. Dargue
Passenger: Lt.Col. Charles W. Bundy
Passenger: Lt.Col. George W. Rickey
Passenger: Major Hugh F. McCaffery
Pete