PDR

The Horsehead Nebula is a well-known photodissociation region, or PDR.

And one bore the legend, “12 Pdr Boat Howitzer 1856” and “U.S.N.Y. Washington.”

PDR, as he or she is known — Jacoby is not certain it is male — has a curved fin with two notches at the top and a scoop at the base.

“Subsequent investigation by the FBI confirmed that PDR was only able to decrypt the victim’s files by paying the subject the ransom amount,” the affidavit said.

The agency will commit to the calendar and cost determined during the PDR, and the process of finalizing design and fabricating the hardware can begin.