This is a Notable Technology milestone.
This was a program sponsored by the Office of Naval Research, using a Kaman HTK-1 as the test vehicle (designated HTK-1K)
A video of the aircraft in flight can be seen by selecting the link below,
Kaman HTK-1K - the first unmanned helicopter, by sobchakvideos, YouTube, accessed Mar 29 2017
Note: The exact day for this milestone is unknown