Vandenberg Air Force Base Minute Man III Launch GT 218

As Reuters adds, demonstrating the reliability of the nuclear force has taken on additional importance recently because the U.S. arsenal is near the end of its useful life and a spate of scandals in the nuclear force two years ago raised readiness questions.

The Defense Department has poured millions of dollars into improving conditions for troops responsible for staffing and maintaining the nuclear systems. The administration also is putting more focus on upgrading the weapons.

President Barack Obama’s final defense budget unveiled this month calls for a $1.8 billion hike in nuclear arms spending to overhaul the country's aging nuclear bombers, missiles, submarines and other systems.