https://digitalcommons.unl.edu/icwdm_usdanwrc/1936/
"Impact locations and damage to civil and military rotary-wing aircraft" by Brian E. Washburn, Paul...
Rotary-wing aircraft (e.g., helicopters and tilt-wing aircraft) are an important component of all U.S. military services and the U.S. civil aviation industry....
military rotary wingimpactlocationsdamagecivil