Slipping under my radar a bit, I did not notice a new memorandum posted a couple of days ago until today. The actual content of the proposed budget sent to Congress received ample news coverage, but I do not recall seeing or hearing anything about a presidential memorandum on the budget.
It is a letter to the Speaker of the House accompanying his budget proposal. It is basic in that is summarizes and attempts to justify increases in spending on military and security. The real substance is in the budget proposal itself.
Memorandum Title: Text of a Letter from the President to the Speaker of the House of Representatives
Posted March 16, 2017.