An official website of the United States Government 
Here's how you know

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( lock ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Photos

Snapshots of what’s happening in the Defense Department.

A jet engine is mounted indoors in a stand.

General Electric J85

MetroLaser, Inc., uses the General Electric J85 engine, seen here, at the University of Tennessee Space Institute’s Propulsion Research Facility near Arnold Air Force Base, Tenn., to study its three-component planar Doppler velocimetry, or PDV, measurement system for optical, non-intrusive measurements of exhaust gas velocity Nov. 18, 2021.

Photo Gallery