I picked up this lighter recently that was part of a small early U.S. Army missile grouping. It's a small Japanese made Vulcan brand lighter. This one is pretty small - smaller than the other Vulcan lighters I have in my collection which are already smaller than a Zippo.
Looks like the original owner was part of the 84th Artillery, equipped with the MGM-5 Corporal Nuclear Missile. From what I have read, the Corporal was pretty unreliable and dangerous to it's crew due to the liquid fuel of its day.