A U.S. Army Reserve Soldier from the 409th Engineer Vertical Construction Company of Windsor, Colorado, prepares to enter a mock urban search and rescue operation in an area with chemical, biological or nuclear contamination during Guardian Response 22 at Muscatatuck Urban Training Center, Indiana, April 29, 2022. Guardian Response 22 is a homeland emergency response exercise that provides realistic disaster response training to sharpen the skills and increase the capabilities of the U.S. Army Reserve Soldiers. (U.S. Army Photo by Sgt. Juan F. Jimenez)