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NASA, DARPA Will Test Nuclear Engine for Future Mars Missions - But then that's been stated periodically in the past.
https://www.nasa.gov/press-release/nasa-darpa-will-test-nuclear-engine-for-future-mars-missions
Obviously we won't be sending a manned mission to Mars by 2020 or 2024, and likely not before 2030, if ever.
https://www.physicsforums.com/threads/manned-mars-mission-to-mars-before-2020.243659/
See some history here
https://www.physicsforums.com/threads/the-nuclear-power-thread.9091/post-6879441
https://www.nasa.gov/press-release/nasa-darpa-will-test-nuclear-engine-for-future-mars-missions
NASA and DOE are working another commercial design effort to advance higher temperature fission fuels and reactor designs as part of a nuclear thermal propulsion engine. These design efforts are still under development to support a longer-range goal for increased engine performance and will not be used for the DRACO engine.
Obviously we won't be sending a manned mission to Mars by 2020 or 2024, and likely not before 2030, if ever.
https://www.physicsforums.com/threads/manned-mars-mission-to-mars-before-2020.243659/
See some history here
https://www.physicsforums.com/threads/the-nuclear-power-thread.9091/post-6879441