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The United States Army Air Assault School, officially the Sabalauski Air Assault School (TSAAS), is a Army Forces Command Table of Distribution and Allowances unit located at Fort Campbell, Kentucky. Its primary task is training leaders and soldiers assigned to the 101st Airborne Division (AASLT), other United States Army units, and United States Armed Forces service members. The school is named for Command Sergeant Major Walter James Sabalauski.
Air Assault School teaches several courses annually. The rigorous, fast-paced training is known as the 10 (or 11) toughest days in the United States Army. About 15 percent of the class does not make it through the first day, dubbed Zero day, which includes a demanding obstacle course. More fail to make it past sling load testing in phase two. Ultimately, roughly 55 percent fail to graduate.
https://en.wikipedia.org/wiki/United_States_Army_Air_Assault_School