What is the definition of a middle tier acquisition? is it the same as a non-MDAP? An ACAT II?
Middle Tier Acquisition is not defined by ACAT level, but is an acquisition pathway that is separate from the traditional acquisition methodology delineated in the DoD5000.02 for rapid prototyping and rapid fielding. The term Middle Tier Acquisition is more appropriately stated in the full context as noted in the Under Secretary of Defense (Acquisition and Sustainment) memo Middle Tier of Acquisition (Rapid Prototyping/Rapid Fielding) Interim Authority and Guidance dated 16 Apr 2018. Paragraph 1 states that " Under the Middle Tier of Acquisition, programs subject to the guidance shall not be subject to the Joint Capabilities Integration Development System (JCIDS) manual and DoD Directive 5000.01, "The Defense Acquisition System," except to the extent specifically provided in the implementing guidance." Implementation guidance states "Subject to the provisions of Section 804, organizations utilizing this authority are authorized to initiate Middle Tier of Acquisition Rapid Prototyping programs with the objective to field a prototype that can be demonstrated in an operational environment and provide for a residual operational capability within five years of the development of an approved requirement, and Middle Tier of Acquisition Rapid Fielding programs that shall begin production within six months and complete fielding within five years of an approved requirement. The DoD Components will determine what constitutes an approved requirement or may leverage an existing requirement."
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A DAU prepared overview of MTA is located here: https://www.dau.mil/training/career-development/program-management/_layouts/15/WopiFrame.aspx?sourcedoc=/training/career-development/program-management/Documents/OUSD16Apr18Memo-MiddleTierAcqv2.pptx&action=default&DefaultItemOpen=1
The OUSD Memo is located here: https://www.dau.mil/training/career-development/program-management/blog/OUSD-(AandS)-Memo-on-Middle-Tier-Acquisition-Authority
The Air Force interim guidance for implementation is located here: https://www.dau.mil/training/career-development/logistics/blog/Assistant-Secretary-of-the-Air-Force-Memo-on-Rapid-Prototyping