ST. LOUIS (KSDK) - At least 13 people are dead after authorities say 34-year-old Aaron Alexis of Fort Worth opened fire at the Navy Yard in Washington, D.C. Many others are injured.
Police shot and killed Alexis.
PHOTOS: Navy Yard shooting
Retired U.S. Navy officer Rear Admiral Dan Kloeppel joined NewsChannel 5 on Monday to explain what the Washington Navy Yard is, how many people work there, and what they do.
Click the video player above to watch his interview.