The gunner's seat. Apparently, the height restriction to get in (in a very convoluted fashion) was 5' 8". And you get in from inside the plane just when the action starts. I understand that at least once the gunner was killed when the plane belly landed.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/80441498@N00">Venkat Mangudi</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/venkatmangudi/25376351333/">P3221974</a>