Research scientist Leila Walker (left) is assisted by nutritional physiologist Holly McClung as they demonstrate equipment designed to evaluate fitness levels in female soldiers who have joined elite fighting units such the Navy SEALs, at the U.S. Army Research Institute of Environmental Medicine, at the U.S. Army Combat Capabilities Development Command Soldier Center, in Natick, Mass. (AP Photo/Steven Senne)

Research scientist Leila Walker (left) is assisted by nutritional physiologist Holly McClung as they demonstrate equipment designed to evaluate fitness levels in female soldiers who have joined elite fighting units such the Navy SEALs, at the U.S. Army Research Institute of Environmental Medicine, at the U.S. Army Combat Capabilities Development Command Soldier Center, in Natick, Mass. (AP Photo/Steven Senne)

Military studies ‘hyperfit’ women who pass grueling courses

Army medical researchers hope to uncover answers in a just-launched voluntary study.

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