This Justification and Approval (J&A) is for the award of sole source contract N0042126C0012 to Applied Physical Electronics, LC for the modernization of the Vertical Electromagnetic Pulse Simulator (... This Justification and Approval (J&A) is for the award of sole source contract N0042126C0012 to Applied Physical Electronics, LC for the modernization of the Vertical Electromagnetic Pulse Simulator (VEMPS) in Patuxent River, Maryland. This J&A is posted in accordance with FAR 6.305.