However , all VISE - themed proposals have thus far been unsuccessful .
The VISE concept has been identified as a desired theme for mission proposals over several rounds of NASA 's competitive mission selections , including those to select the 2nd , 3rd and 4th New Frontiers missions .
All VISE - themed proposals have thus far been unsuccessful .
The VISE concept has been identified as a desired theme for mission proposals over several rounds of NASA 's competitive mission selections , including those to select the 2nd , 3rd and 4th New Frontiers missions .