This is the 13424th most frequent German word.
bemannten
"Manned" or "crewed."
In this sentence, 'bemannten' is the plural adjective describing 'Raumfahrtmissionen', meaning they are directly operated or occupied by humans.
Die bemannten Raumfahrtmissionen erfordern sorgfältige Planung.
The manned spaceflight missions require careful planning.
Here, 'bemannten' is used as an adjective describing 'Boote', indicating these boats have personnel aboard for operation or management.
Die bemannten Boote können längere Fahrten unternehmen als unbemannte.
The manned boats can undertake longer journeys than unmanned ones.
In this case, 'bemanntes' serves as an adjective modifying 'Fahrzeug', denoting it is controlled or staffed by human operators.