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In this April 23, 2019, file photo, research scientist Leila Walker, left, is assisted by nutritional physiologist Holly McClung, center, as they demonstrate equipment designed to evaluate fitness levels in female soldiers, not shown, 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)

In this April 23, 2019, file photo, research scientist Leila Walker, left, is assisted by nutritional physiologist Holly McClung, center, as they demonstrate equipment designed to evaluate fitness levels in female soldiers, not shown, 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)

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