National Guard troops in Washington for the inauguration, USS Mount Whitney's 50th anniversary, the upcoming Army Best Medic Competition and more in this week's Frontline Photos.
A study of Marine recruits found that despite these measures and strict quarantines before they started training, the recruits spread the virus to others even though hardly any of them had symptoms.
A helicopter crew from Naval Air Station Whidbey Island rescued a hiker who was severely injured in a fall Sunday evening in the Buckhorn Wilderness area of the Olympic Mountains.
Blue Angels and Thunderbirds participate in "Salute to America" flyovers, dual carrier operations in the Indo-Pacific, and more in this week's Frontline Photos.