; and (2) mandatory for personnel from other relevant organizations in each of the military services and Defense Agencies, including organizations responsible for engineering, budgeting, contracting, test and evaluation, requirements validation, and certification and accreditation, that support those program offices. (d) Agile Acquisition coach (1) In general The Secretary and the senior acquisition executives in each of the military services and Defense Agencies, in coordination with the Director of the Defense Digital Service, shall ensure that program offices pursuing Agile Acquisition methods have access to an Agile Acquisition coach. (2) Expertise The Agile Acquisition coach shall possess expertise in— (A) commercial Agile Acquisition methods; and (B) the acquisition system and processes of the Department of Defense. (3) Duties The Agile Acquisition coach shall— (A) assist program offices, supporting stakeholder organizations, and personnel in properly applying Agile Acquisition methods; and (B) notify the appropriate acquisition authorities if programs are deviating from best practices or are not receiving appropriate support from stakeholder organizations, in a manner or to a degree that threatens the success of the program. (e) Agile Acquisition research program The President of the Defense Acquisition University shall establish a research program to conduct research on and development of Agile Acquisition practices and tools best tailored to meet the mission needs of the Department of Defense. (f) Definitions In this section the term “Agile Acquisition”— (1) means acquisition pursuant to a methodology for delivering multiple, rapid, incremental capabilities to the user for operational use, evaluation, and feedback; and (2) involves— (A) the incremental development and fielding of capabilities, commonly called “spirals”, “spins”, or “sprints”, which can be measured in a few weeks or months