New Delhi: Delta 4 heavy was developed in partnership with the U.S. Air Force (USAF) Evolved Expendable Launch Vehicle (EELV) program, the Delta IV family of launch vehicles combines design simplicity, manufacturing efficiency, and streamlined mission and vehicle integration to launch high-priority USAF, National Reconnaissance Office (NRO), NASA, and commercial payloads to orbit.
The Delta 4-Heavy is America's largest unmanned rocket currently in service, capable of lofting the biggest and heftiest cargos. The mammoth vehicle is created by taking three Common Booster Cores — the liquid hydrogen-fueled motor that forms a Delta 4-Medium's first stage — and strapping them together to form a triple-barrel rocket, and then adding an upper stage.
