The National Nuclear Security Administration is pursuing avenues to reduce the risk of production delays in the W80-4 nuclear warhead life extension program -- an issue that has caught the attention of a congressional watchdog. In a series of emails to Inside Defense, NNSA spokesman Dov Schwartz described efforts that aim to mitigate concerns with industry’s capacity to produce and supply explosives, or what the Government Accountability Office called a "fragile supplier base" in a June report . Schwartz...