![](http://www.alamy.com/thumbs/6/C5308859-E832-4F7F-B9CB-3F4D2D11872C/E1GBE5.jpg)
Navy Hospital Corpsman 1st Class Michael Astorga crawls through a mud pit during a tactical combat casualty care field exe
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Photo credit: © 501 collection / Alamy / Afripics
License: Licensed
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