Which of the following agencies is NOT typically a main player among U.S. agents overseas?

NASA is not typically considered a main player among U.S. agents overseas because its primary focus is on space exploration and scientific research rather than law enforcement or national security activities. While NASA may have international collaborations for its projects, it does not engage in the types of operations carried out by agencies like the DEA, FBI, or Secret Service, which are directly involved in criminal investigations, counter-terrorism, and protection of national figures and assets.

The DEA (Drug Enforcement Administration), FBI (Federal Bureau of Investigation), and Secret Service are all involved in various international operations related to crime and security. The DEA combats drug trafficking, the FBI handles a wide range of criminal investigations including terrorism, and the Secret Service protects the President and other leaders, as well as investigates financial crimes. These agencies have established international relationships and operatives to work on these issues, whereas NASA's mission does not align with law enforcement roles overseas.