"We don't know the exact number," Precourt said at the time. "We're striving every day to not make it be any, but we're anticipating a small number."
Precourt emphasized at the time that the looming cuts in early 2013 would not be part of the earlier stream of layoffs that occurred in the previous 3-1/2 years, which were largely related to the end of the space shuttle program and resulted in more than 2,000 employees being let go.
On Thursday, Helquist said the latest reduction was the result of cutbacks in funding for some ATK programs, on-going consolidation throughout the company and changes in business climate and production rates at its manufacturing facilities.
"While this layoff is smaller than those we have conducted in the past, reductions are never easy,'' she said. "We have lost some very talented individuals."
The layoff impacted the workforces at all three of ATK's Utah plants in Promontory near Brigham City,in Magna and Clearfield.
"For those who were laid off, we have offered severance benefits and out-placement services," Helquist said.
On Thursday, ATK also reported that a day earlier it has successfully tested its newly developed CASTOR 30XL upper stage solid-fuel rocket motor at the U.S. Air Force's Arnold Engineering Development Complex in Tennessee.
The test was the final qualification for the commercial motor, which was jointly developed by ATK and Orbital Sciences Corp. Designed to ignite at altitudes in excess of 100,000 feet, the motor is intended by use by Orbital on rockets slated to perform commercial cargo re-supply missions to the International Space Station for NASA.