reconnaissance mission is a noun meaning "the act of reconnoitring (especially to gain information about an enemy or potential enemy)". It carries one recorded sense.
the act of reconnoitring (especially to gain information about an enemy or potential enemy)
“an exchange of fire occurred on a reconnaissance mission”
Definitions, synonyms and semantic relations for reconnaissance mission come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.