You can access the State of Washington's Museum of History's 

cell phone audio tour and hear some interesting stories and history

relative to the Nelson M. Walker's trips to Vietnam during the 1966-67 period.

The number is a Tacoma, Washington area code and you will be charged

long distance charges if you do not have a plan that covers long distance

charges for free, but otherwise they provide the audio tour for free.

The display will be in Tacoma until December, 1967 and this

probably will end your ability to listen to the tour.