US nuclear forces have quietly kissed their floppy disks goodbye

Military Tech

VIDEO: Inside the U.S. nuclear enterprise command and control system

For more than 50 years, the Defense Department has used 8-inch floppy disks to control the operational functions of the United States' nuclear arsenal — until now.

This past June, the Air Force replaced the floppy disk with a new "highly secure solid state digital storage solution" in the Strategic Automated Command and Control System (SACCS) that coordinates the Pentagon's land-launched nuclear missiles, nuclear-missile-armed submarines and long-range strategic bombers, 595th Strategic Communications Squadron Lt. Col. Jason Rossi told C4ISRNet on Oct. 17.


SACCS, which attained full operational capability in January 1968 and ran for decades on an IBM Series/1 computer system dating from the 1970s, is the primary network used by U.S. Strategic Command to transmit Emergency Action Message (EAM) to nuclear-capable forces regarding the execution of various attack options in nuclear exchange.

SACCS is usually represented in American pop culture by an emergency flash to a pair of extremely-nervous missile-men in a subterranean launch facilities, a la the famous opening sequence in the 1983 Cold War classic War Games.

"Turn your key, sir!" The famous silo scene from 1983's 'War Games' youtu.be

This solution has been a long time coming. A 2016 Government Accountability Office report on the problem of federal legacy computing systems stated that Pentagon planned on "updat[ing] its data storage solutions, port expansion processors, portable terminals and desktop terminals by the end of fiscal year 2017," including a $60 million "full system replacement" of SACCS scheduled for completion in fiscal year 2020.

According to the GAO report, SACCS in fiscal year 2016 cost $5.6 million for 175 users across the U.S. armed forces to operate and is expected to cost approximately $135 million to operate throughout its lifecycle, which was anticipated to end around 2030.

An example of an 8-inch floppy disk used among U.S. nuclear forces(Government Accountability Office)

As C4ISRNet notes, it's unclear exactly which upgrades, if any, have been fully implemented yet. But according to the GAO report, they can't come soon enough.

"According to Defense officials, the system is made up of technologies and equipment that are at the end of their useful lives," the report says. "The system is still running on an IBM Series/1 Computer, which is a 1970s computing system, and written in assembly language code ... Replacement parts for the system are difficult to find because they are now obsolete."

Despite the looming problems facing the old floppy-based SACCS, 595th SCS commander Rossi told C4ISRNet that the legacy system offered an advantage that will never be obsolete: security

"I joke with people and say it's the Air Force's oldest IT system. But it's the age that provides that security," Rossi told C4ISRNet of the SACCS in an October interview. "You can't hack something that doesn't have an IP address. It's a very unique system — it is old and it is very good."

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