<p>"Equipped for medical evacuation with litters on its skids, the OH-13 made its mark in history during the Korean War. It served as a casualty evacuation helicopter for the United Nations Forces in Korea. . . 
The OH-13E is basically an OH-13D model with modifications to the cabin area to include a three seat configuration and dual controls. It was used for medical evacuations with external stretchers as well as observation and reconnaissance missions"
</p>
from Army Aviation Museum placard
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/62126383@N00">James Emery</a> from Douglasville, United States
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/62126383@N00/2076800180/">OH-13 Sioux_3932</a>