Final answer:
The US military likely did not pursue Hedy Lamarr's invention due to their preference for established military engineers and internally developed technology, as well as the urgency of ongoing R&D projects in the face of espionage concerns at the time.
Step-by-step explanation:
The conclusion that can be drawn as to why the US was not interested in Hedy Lamarr's invention during World War II is centered around the attitudes and priorities of the military at the time. Despite Lamarr's significant contribution to technology with her co-invention of frequency-hopping spread spectrum, the military likely preferred to rely on the expertise of military engineers and their established research and development programs. These programs had already seen massive investment and had produced advances in missile technology and sensitive radar systems, as well as the starting points of computers and artificial intelligence. Considering the stakes of the war and the urgency of the projects at hand, it's plausible that the US military did not prioritize an externally developed technology, especially considering the prevalence of espionage concerns and the desire for controlled, internal innovation.