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No, it's "Missions to and Sample Returns from"

So in expanded form:

"Missions to Nearby Interstellar Objects and Sample Returns from Nearby Interstellar Objects"

"Missions" is redundant, because you're not going to get a sample return without a mission.

So "Collecting Samples from Nearby Interstellar Objects" would have been enough to do the job.

Not really, because "missions without sample returns" (aka "flyby/impactor") is one of the options considered.