Plymouth Tube Co. said that four-time shuttle astronaut and United Space Alliance COO, Dan Brandenstein, visited its Trent Mill in recognition for the AL-6XN® tubing provided for NASA’s Constellation program. Along with the acknowledgment, Brandenstein also presented the Trent Mill a Certificate of Appreciation on behalf of United Space Alliance, which is equally owned by the Boeing Co. and Lockheed Martin Corp. The certificate was presented for the contributions the Trent Plant makes towards the space program.