Chattanooga shootings: Why were our soldiers so vulnerable?

Story highlights

  • Marines, expert at weaponry, were victims of the Chattanooga shootings
  • Kayyem: How can we better protect armed forces on U.S. soil?

Juliette Kayyem, a CNN national security analyst, is a professor at Harvard's Kennedy School of Government, a former assistant secretary in the U.S. Department of Homeland Security and founder of Kayyem Solutions, a security consulting firm. She is also the host of the Security Mom podcast. The opinions expressed in this commentary are hers.

(CNN)Four Marines, heavily trained and masters in the ar