Secretary of Defense Ash Carter visited U.S. Army Fort Knox today to meet with U.S. Army ROTC cadets participating in leadership training. He was able to witness first-hand the rigorous training exercises these young men and women are engaging in to strengthen their skills and prepare for active duty.

Have you ever heard of Naval Sea Systems Command? They are the Nation's team accountable for the health of our U.S. Navy. The NAVSEA organization has 33 activities in 16 states and today, Secretary of Defense Ash Carter is visiting the Naval Surface Warfare Center, Crane Division. Take a look at what they have to offer!

Naval Sea Systems Command >Warfare Center, Crane Division
navsea.navy.mil|By Naval Sea Systems Command

We lost a true hero today. Staff Sgt. David Thatcher, a Doolittle Raider, was an inspiration to the DoD family. Rest in peace sir. ‪#‎Salute‬

Gen. Mark A. Welsh III's photo.
Gen. Mark A. Welsh III
12 hrs

America and its Air Force lost a true hero this morning with the passing of Staff Sgt. David Thatcher, one of the two surviving Doolittle Raiders. Thatcher, the...n a corporal, was engineer/gunner in the back end of a B-25, one of 16 sent on that historic suicide mission to bomb Japan. They stunned that country, punctured its aura of invulnerability, and gave America hope just 4 months after the attack on Pearl Harbor.

His actions were, in the words of the logistics officer for the mission: "Beyond the limits of human exertion, beyond the call of friendship, beyond the call of duty."

He inspired a nation and lived a life devoted to all we hold dear as Airmen. Betty and I will keep Staff Sgt. Thatcher and all who loved him in our thoughts and prayers. r/mark

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Today, at 12:50 p.m. EDT, Secretary of Defense Ash Carter will participate in a troop talk with service members from U.S. Army Fort Knox, KY. Watch ‪#‎LIVE‬ on Defense.gov

U.S. Department of Defense (DoD)'s photo.

This is Fort Knox!

Later today, Secretary of Defense Ash Carter will visit U.S. Army Fort Knox. While there, he'll tour the U.S. Army post, meet with troops and talk about new ‪#‎ForceoftheFuture‬ initiatives.

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Full speed ahead...

U.S. Navy Petty Officer 3rd Class Joseph Camp navigates a waterway during an annual training exercise at U.S. Army Fort Knox. The coastal riverine force is a core Navy capability that provides port and harbor security, high value asset protection, and maritime security operations in coastal and inland waterways.

Navy photo by Petty Officer 2nd Class Gabriel Bevan

U.S. Department of Defense (DoD)'s photo.

More than just man's best friend, a wingman too! We appreciate our military service dogs for everything they do for our troops. ‪#‎WingmanWednesdays‬

U.S. Department of Defense (DoD)'s photo.

They've spent the past week pushing themselves to the limit, representing their service. Tonight the teams gather for the closing ceremony of Warrior Games! Don't miss LIVE coverage tonight! ‪#‎WarriorGames‬

U.S. Department of Defense (DoD)'s photo.

The 2016 Warrior Games come to a close today. We salute all the athletes who have competed this week and shown what it means to be a resilient warrior. In this photo, USMC veteran Lance Cpl. Jenna Bisone swims freestyle during the 2016 Department of Defense Warrior Games at United States Military Academy June 20, 2016. (DoD photo by EJ Hersom)

U.S. Department of Defense (DoD)'s photo.

As the 2016 Department of Defense Warrior Games come to a close, check out some of the best photos from the events.

U.S. Marine Corps Cpl. Hammack walked away from her first ever Warrior Games with more than just a gold medal.

Shooting an arrow is hard enough, but imagine doing it while blindfolded. Warrior Games introduced the first ever visual impairment category of the archery competition this year. Take a look!

Prepare for entry!

A landing craft air cushion vehicle prepares to enter the well deck of the amphibious assault ship USS Boxer in the Arabian Gulf.

U.S. Navy photo by Seaman Eric Burgett

U.S. Department of Defense (DoD)'s photo.

U.S. Marine Corps provides suppressive machine gun fire for ground units during Integrated Training Exercise 4-16. The exercise allows Reserve Marines to train in realistic environments to increase their proficiency and readiness for worldwide deployment. Marine Forces Reserve ‪#‎MarineMondays‬

U.S. Department of Defense (DoD)'s photo.

Starting with a Warrior Games engagement to the U.S. Navy commissioning its latest destroyer, there's no shortage of spectacular stories in today's SITREP. Check it out!

At 1:30pm EDT Secretary of Defense Ash Carter welcomes new Secretary of the Army Eric Fanning. Watch live on Defense.gov.

U.S. Department of Defense (DoD)'s photo.

At 11am EDT, Secretary of Defense Ash Carter will provide the keynote address at the Center for a New American Security - CNAS. Watch live on Defense.gov.

U.S. Department of Defense (DoD)'s photo.

1,410 hackers went to work on DoD's critical online systems and found 138 vulnerabilities - a discovery that's actually making our security systems better. Here's how the recent "Hack the Pentagon" program has been a big win for the nation's safety and security.

Hacking the Pentagon
medium.com|By Defense Digital Service

What's happening around the world?
U.S. Marine Corps post security after an amphibious transition from ship to shore during CARAT - Cooperation Afloat Readiness and Training. ‪#‎MarineMondays‬

U.S. Department of Defense (DoD)'s photo.

You've seen an aerial refueling but have you ever seen a replenishment-at-sea?

USS Mason, right, and Italian navy destroyer ITNS Andrea Doria receive alternative fuel during a replenishment-at-sea with the Italian oiler ITNS Etna. Mason, deployed with the Eisenhower Carrier Strike Group, is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe. U.S. European Command (EUCOM)

U.S. Navy photo by Mass Communication Specialist 1st Class Rafael Martie

U.S. Department of Defense (DoD)'s photo.