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Who's hacking the U.S.? It's not an easy question to answer, defense leaders told lawmakers, as determining if a malicious cyber attacker is a foreign government, a cyber criminal or a cyber criminal supported by a foreign government is never clear.

The Defense Department is finding new ways to reduce development, production and sustainment costs for the F-35, which is the "quarterback" of the joint force, said the program executive officer for the F-35 Lightning II Joint Program Office.

To defend the nation, we must reform the Defense Department and work more effectively with allies and partners, a DOD official said.

Each day that Pentagon Press Secretary John F. Kirby briefs reporters, he has a statement about U.S. exercises around the world, such as Defender-Europe 21, an exercise designed to build readiness and interoperability among NATO allies and partners.

For as long as she can remember, Army Col. Danielle Ngo wanted to be a soldier. Today she encourages young people to consider serving, whether it be in their communities or in the military.

Air Force Maj. Shana Hirchert discussed her work as a flight physician assigned to the 353rd Special Operations Support Squadron while participating in a search and rescue exercise.

Alejandro Villanueva served three tours in Afghanistan as an Army Ranger. During one deployment, he received the Bronze Star Medal for battlefield valor. He later made a name for himself in the NFL.

Gail Belmont started quilting in 1997 to help with her emotional and physical pain from serving in the military during the Vietnam War.

The Defense Department serves as an innovative leader in developing technology to protect all Americans – on and off the battlefield.

The Defense Department is committed to working with allies, partners and like-minded nations in the Indo-Pacific and to upholding a free and open region founded on respect for international rules, laws and norms.

The Defense Department pays tribute to the contributions and dedicated service of Asian Americans and Pacific Islanders, past and present, in defense of the nation during May and throughout the year.

The planet's changing climate has a significant effect on Defense Department missions, plans and installations. DOD is elevating climate change as a national security priority, integrating climate considerations into policies, strategies and partner engagements.