I mean "probe agency"? Should say it all don't you think? Probes are unmanned craft.
Not necessarily. It's become a convention to use the word "probe" for unmanned craft, but any craft that explores could be called a probe. I get 1650 Google hits for "manned probe" and 14,000 for "unmanned probe," which indicates that the unmanned kind is more common, but the very commonality of the phrase "unmanned probe" proves that there has to be a manned kind as well.