The Stealth Program was an American effort to develop aircraft designed to avoid detection.
An early attempt at stealth technology was the Lockheed SR-71 strategic reconnaissance aircraft. It was designed to minimize its radar cross-section.
John Skeevers worked for Lockheed and helped develop the SR-71. He later contracted cancer and blamed the government of poisoning him. Philip used that information in order to get him to reveal classified data on the program.
RAM is Radar-absorbent material. Skeevers discovered that he should use microscopic iron balls suspended in paint.