Two (2) each of NSN 1560-01-263-4414. This acquisition is restricted to qualified sources (Include Aerospace & Commercial Technologies CAGE 1XKR3 and Lockheed Martin CAGE 81755). Contractors desiring ... Two (2) each of NSN 1560-01-263-4414. This acquisition is restricted to qualified sources (Include Aerospace & Commercial Technologies CAGE 1XKR3 and Lockheed Martin CAGE 81755). Contractors desiring to become a qualified source must submit a qualification package. Please see clause 52.209-1 and the attached Manufacturing Qualification Requirement for additional details.