Performance Bar The Performance Readiness Bar is a calcium- and vitamin D-fortified snack bar developed under the research guidance of the U.S. Army Research Institute of Environmental Medicine’s Military Nutrition Division. The new snack was prompted by military health researchers’ realization that basic trainees are doubly vulnerable to bone injury. SHARE IMAGE: Download Image: Full Size (1.04 MB) Tags: Army Photo By: Mallory Roussel, Army VIRIN: 180131-A-N1234-007C.JPG Photo Gallery