Raytheon appears to have missed the window to protest the Army's award to Lockheed Martin of the A4 Sentinel radar upgrade, conceding defeat in the estimated $3 billion project the same week the company won a potentially larger Army radar program, the Lower Tier Air and Missile Defense Sensor . On Oct. 17, the window for Raytheon to protest the A4 Sentinel Radar upgrade contract appears to have closed; as of Oct. 22, the Government Accountability Office docket does not...