Final answer:
The complete title of an activity in the U.S. Navy is formally described in OPNAV Notice 5450 and the SNDL, but the specific title requires reference to the latest versions of these documents.
Step-by-step explanation:
The complete and unabbreviated title of an activity as published by OPNAV Notice 5450 and the Standard Navy Distribution List (SNDL) is typically a formal description of a unit or command within the United States Navy. These titles are used for official documentation, and they reflect the exact nature and purpose of the unit in accordance with naval guidelines and standards. However, to provide the specific full title of an activity, one would need to reference the most current version of OPNAV Notice 5450 or the SNDL, as these documents are periodically updated and the titles can change over time.