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.

Image of atomic model.

Coronavirus

Atomic model gathered by X-ray crystallography of the portion of the respiratory syncytial virus that attacks human cells.

  • Download: Full Size (0.22 MB)
  • Credit: Walter Reed Army Institute of Research VIRIN: 200317-O-ZZ999-4444M.JPG
Photo Gallery