Firm grasp
200513-F-JT831-019.JPG Photo By: Senior Airman Xiomara M. Martinez

JOINT BASE ANDREWS, Md. - A blood donor squeezes a ball during a blood drive at Joint Base Andrews, Md., May 13, 2020. Squeezing a ball causes arm muscles to contract and increase venous outflow. Units collected at the drive are transported back to the Armed Services Blood Bank Center and stored in specialized blood product refrigerators. (U.S. Air Force photo by Senior Airman Xiomara M. Martinez)


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