It is not found in any setting other than the office environment, and is not produced by anyone other than a person in a supervisory or managerial position. Although I now hold such a position and am, therefore, one of the Worshipful Company of Memo-Producers, for a number of years I was not a member of the elect and did not produce memos. I am a Yummie. Which is unfortunate. We must learn to speak Memoese, the lingua franca of administration.
Acronyms are the radiocarbon tracers of a genuine Memoese document.
One must never use entire groups of words or phrases which name an organization, project, working group, task force, ad-hoc committee, corporate body or even general concept, in place of an acronym. That would be like speaking with spinach between the teeth. It is not done. Single memo documents are frequently not the basic unit upon which the OOP operates. In order to avoid grievous linguistic faux-pas and public humiliation, it is vital to recognize in every situation what comprises a memo group, and thus how frequently you may safely use whole words and phrases.