There are some details on the Pease Air Force Base here.
http://en.wikipedia.org/wiki/Pease_Air_ ... Guard_Base
It would appear that the base became operational in the 1954-56
time frame. "The Rail Lines of Northern New England" by Robert
M Lindsell (2000) states that the spur was built in the mid-1950's.
Initially, the base received tank cars of jet fuel, etc., but at some
point, time frame unknown, a pipeline was run from a pier on the
Piscataqua River to the base. Freight shipments continued to the
base commasary for a while longer. However, I think all rail freight
service to the base has ceased prior to the 1988 decision to put the
base on the BRAC closure list. I am not sure what year all trackage
on the base was removed.