A secret US offensive in 2016 and 2017 used an unusual strategy to defeat the Islamic State. The plan: Put a minimal number of American boots on the ground,.
Many U.S. troops who fired vast numbers of artillery rounds against the Islamic State developed mysterious, life-shattering mental and physical problems. But the military struggled to understand what was wrong.
Fighter pilots are testing a new lightweight helmet that could allow for better visibility when engaging enemy jets. The helmet also fits female pilots better.