A nurse with the Samaritan Purse nonprofit organization comforts a 12-year-old girl role playing as an injured civilian at the Palmer Fairgrounds in Palmer, Alaska, March 28, 2014, during exercise Ardent Sentry 2014. Ardent Sentry is a NORAD and U.S. Northern Command (USNORTHCOM)-directed exercise focusing on defense support of civil authorities in response to simulated weather, security and disaster contingencies. While Ardent Sentry is primarily a command post exercise, several field training events were conducted at various locations within the USNORTHCOM area of responsibility.