Master Sgt. Jeremy Nichols, a former dog handler for the 55th Security Forces Squadron and now a full-time member of the Office of the Warrior Advocate, hugs his two-year-old Post-Traumatic Stress Service Dog, Willow, Dec. 6, 2019, Offutt Air Force Base, Neb. Willow assists Nichols with his Invisible Wounds, which is defined as post-traumatic stress disorder; traumatic brain injury; or other cognitive, emotional, or behavioral conditions associated with trauma experienced by an individual. (U.S. Air Force photo by Josh Plueger)

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Photo by: Josh Plueger |  VIRIN: 191206-F-XV591-0003.JPG