[Milsurplus] What is it?

[Hole in the Head Press]

What's going on here? 
<https://www.flickr.com/photos/byteboy/20048374753/in/album-72157629119115285/>

Thanks,

-- 
Sam Stokes, Publisher, KG6XYZ
3rd Edition of Rings of Supersonic Steel
The Last Missile Site
Fort Baker Through the Years: The Post, the Park, the Lodge
http://www.holeintheheadpress.com