Oldest open-source software kept by Army

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OSS

Since 1938, the Ballistic Research Laboratory at Aberdeen Proving Ground, Md., was the center for the United States Army's research efforts in ballistics and vulnerability/lethality analysis. That remained the case until 1992, when BRL was disestablished and its mission, personnel and facilities were incorporated into the newly created U.S. Army Research Laboratory.

But during the decades of providing support to the nation, BRL quickly became involved in the move toward modern computing. Indeed, nearly 70 years ago, BRL unveiled the Electronic Numerical Integrator and Computer — ENIAC, the world's first operational, digital computer.
The development of this computer was driven by the Army's need to speed calculation of firing tables. And ever since the development of the ENIAC, ARL has provided the U.S. military with unprecedented scientific computational capabilities.

One such capability was BRL-CAD.

rest here