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The Associated Press was granted and weapons production facilities to see how technicians keep the arsenal working while starting the government's .

This is how they do it and who they are:

SHAKE, RATTLE AND ROLL

Because the U.S. no longer conducts explosive nuclear tests, scientists are not exactly sure how aging warhead plutonium cores affect detonation. For more common parts, like the plastics and metals and wiring inside each detonator, there are also questions about how the years spent in warheads might affect their integrity.

So workers at the nation's nuclear labs and production sites spend a lot of time stressing and testing parts to make sure they're safe. At the Energy Department’s , where warheads are maintained and made, technicians put components through endless tests. They heat weapons parts to extreme temperatures, drop them at speeds simulating a plane crash, shoot them at high velocity out of testing guns and rattle and shake them for hours on end. The tests are meant to simulate real world scenarios — from hurtling toward a target to being carted in an Air Force truck over a long, rutty road.

Technicians at the conduct similar evaluations, putting plutonium under extreme stress, heat and pressure to ensure it is stable enough to blow up as intended. Just like the technicians in Kansas City, the ones in Los Alamos closely examine the tested parts and radioactive material to see if they caused any damage.

RELYING ON OLD BLUEPRINTS

The lack of explosive tests — banned since the George H.W. Bush administration by an international treaty — has also meant that the scientists have been forced to rely on warhead designs that were created many decades ago.

That's because each of those original designs had been certified, and the best way to certify a weapon works as designed is to blow it up. Changing even one component introduces uncertainty.

Further complicating matters — because the weapons are so old — many of those original manufacturers and contractors have gone out of business. That has forced the nation's nuclear labs to reverse engineer old parts, such as a peroxide that was used to treat warhead parts, but is no longer in production. So lab technicians are working to reinvent it.

Re-engineering parts is getting easier with advances in computer-aided design and 3D printing. Kansas City technicians are experimenting with 3D printers to create some warhead parts, such as a micro-honeycombed, rubbery layer that will serve as a cushion for a warhead radar systems.

THE WORKERS ARE YOUNGER THAN THE WARHEADS

It's not unusual to see a 50-year-old warhead guarded or maintained by someone just out of high school, and ultimate custody of a nuclear weapon can fall on the shoulders of a service member who's just 23.

That is what happened on a recent afternoon in Montana at , where Senior Airman Jacob Deas signed a paper assuming responsibility for an almost 3,000-pound Minuteman III intercontinental ballistic missile warhead, as it was lifted out of the Bravo-9 silo and escorted back to base for work.

A sea swell of government retirements has meant that experience level in the civilian nuclear workforce has shifted dramatically. At the Kansas City campus, for example, just about 6% of the workforce has been there 30 years or more — and over 60% has been at the facility for five years or less.

That change has meant more women have joined the workforce, too. In the cavernous hallways between Kansas City's secured warhead workrooms are green and white nursing pods with a greeting: “Welcome mothers."

At Los Alamos, workers' uniform allowance now covers sports bras. Why? Because underwire bras were not compatible with the secured facilities' many layers of metal detection and radiation monitoring.

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The Associated Press receives support for nuclear security coverage from and . The AP is solely responsible for all content. Del Wilber is the Washington investigations editor for the AP.