A father and son from Genesee County have pleaded guilty in an investigation of welding work on Tomahawk missiles.
Dennis Frederick and son Brian Frederick acknowledged they lied to the government about their company's work on parts of the missile. They appeared Wednesday in Flint federal court.
Precision Metal Spinning in Fenton had a contract to weld seams on the outer wall assembly of missile engines. But it had difficulty meeting specifications and instead hired another company to do the job.
Cracks were discovered in 2011 by Williams International, the company supplying engines to the main missile contractor.
The government is recommending 18-month prison sentences for the Fredericks when they return to court on Sept. 3.