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.

Maj. Gen. Charles Lyon holds up a HEPA filter while talking about the oxygen delivery system of the F-22 Raptor during a briefing for the media on the F-22 Scientific Advisory Board findings in the Pentagon Press Briefing Room on March 29, 2012.

Maj. Gen. Charles Lyon holds up a HEPA filter while talking about the oxygen delivery system of the F-22 Raptor.

Maj. Gen. Charles Lyon holds up a HEPA filter while talking about the oxygen delivery system of the F-22 Raptor during a briefing for the media on the F-22 Scientific Advisory Board findings in the Pentagon Press Briefing Room on March 29, 2012.

Photo Gallery