Toxic Training U.S. sailors participate in simulated toxic gas casualty training aboard the USS Ronald Reagan near Yokosuka, Japan, Dec. 26, 2015. The Ronald Reagan provides a combat-ready force that protects and defends interests of allies and partners in the Indo-Asia-Pacific region. U.S. Navy photo by Petty Officer 3rd Class Nathan Burke SHARE: Download: Full Size (0.51 MB) Credit: Navy Petty Officer 3rd Class Nathan Burke VIRIN: 151226-D-HV319-047.JPG Photo Gallery