sentences:  Commanded Manual Direction Center (MDC) at Roslyn Air Force Station, New York (P-3) 1948–1958 directing interceptor units to aircraft identified by Aircraft Control and Warning Squadrons at radar stations in AOR.It employed off shore naval picket ships, fixed "Texas Tower" radar sites, airborne early warning units, and a civilian Ground Observer Corps program.The latter phased down when the SAGE program was implemented.