Last week, Secretary of Defense Jim Mattis released the 2018 National Defense Strategy (NDS). Here is what you should know about this quadrennial national security report.

In light of its actions in 2016, there should be no question as to whether Vladimir Putin’s Russia is or can be a friend.

The U.S. Defense Department contains an inventory of roughly 7,100 nuclear warheads. About 4,760 are active, while approximately 2,340 warheads are retired, but still intact. The retired warheads are in storage and await dismantlement. Here is what you should know about nuclear weapons:

Seventy years ago this week, President Harry Truman signed into law the National Security Act of 1947. Here is what you should know about “the law that transformed America.”