<div class="description">
<ul><li><b>Scope and content:</b>  Original caption: Being readied for testing in the U.S. Navy's centrifuge at Johnsville, Pennsylvania is Virgil I. Grissom, 35, one of three astronauts chosen for the first manned suborbital flight of Project Mercury, the National Aeronautics and Space Administration's manned space flight program.</li></ul></div>
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Unknown author<span style="display: none;">Unknown author</span> or not provided</div>
April 1961
<a href="https://en.wikipedia.org/wiki/U.S._National_Archives_and_Records_Administration" class="extiw" title="en:U.S. National Archives and Records Administration">U.S. National Archives and Records Administration</a>