This is a Tactical Authentication system used during the Vietnam war era. Doug Neil used the KAL-55B as a forward observer with the 196 LIB in Vietnam. He recalls "it was called it a KAK wheel and was used to call in artillery registration coordinates when not in a contact fire mission. There was a page that told us what cipher to use each day. Every day was different".
KAL-55B photo by Ralph Simpson This is one page from the KAL-55B operating manual . (Photo by Ryan Somma)
1) Ralph Simpson <ralphenator(at)gmail.com>
2) Ryan Somma Flickr Photostream http://www.flickr.com/photos/ideonexus/5176402044/
3) Doug Neil <dneil196(at)gmail.com>