Section 1401.301 - Policy(a)(1) Subject to the authorities in paragraph (c) of this section, the Department issues acquisition regulations which implement or supplement the FAR under the DIAR System. The regulation, as part of the FAR system, is issued in accordance with the policy in FAR 1.301(a)(1).(2) Subject to the authorities in paragraph (c) of this section, the Department also issues internal guidance and instructions under the DIAR System in accordance with the policy in FAR 1.301(a)(2).(b) Public participation in promulgating acquisition regulations, which are published in the FEDERAL REGISTER, shall follow the Department's rulemaking procedures prescribed in Part 318, Chapter 5 of the Departmental Manual (318 DM 5) and the procedures in FAR Subpart 1.5.(c) Regulations and internal guidance under the DIAR System are issued pursuant to the authority of the Secretary of the Interior under 5 U.S.C. 301 and 40 U.S.C. 486(c) . This authority has been delegated to the Assistant Secretary-Policy, Management and Budget under Part 209, Chapter 4.1A of the Departmental Manual (209 DM 4.1A).