High Productivity Computing Systems (HPCS) is a DARPA project for developing a new generation of economically viable high productivity computing systems for national security and industry in the 2002–10 timeframe; an extenuated research specialization that's from High-Performance Computing Systems.
Also (status unknown from official site): A vivid description of this type of work was given by James Bamford in his March 15, 2012 article: The plan was launched in 2004 as a modern-day Manhattan Project.
And as with the Manhattan Project, the venue chosen for the supercomputing program was the town of Oak Ridge in eastern Tennessee, a rural area where sharp ridges give way to low, scattered hills, and the southwestward-flowing Clinch River bends sharply to the southeast.
About 25 miles from Knoxville, it is the "secret city" where uranium- 235 was extracted for the first atomic bomb.
Today, not far from where that sign stood, Oak Ridge is home to the Department of Energy's Oak Ridge National Laboratory, and it's engaged in a new secret war.