HOI 90-4 is listed as current in the AF e-Publishing catalog (publication date 2005-07-08).

Where do I download the official HOI 90-4?

The official copy is published on AF e-Publishing (https://www.e-publishing.af.mil).

HOI 90-4 — Procedures For Air Force Witnesses Participating In Congressional Committee Hearings

HOI 90-4 is listed as current Current
in the AF e-Publishing catalog as of our last index refresh (2026-07-11). Note: its publication date is 2005-07-08 — 21 years old — so check for newer interim changes before citing it.

Branch	U.S. Air Force
Series	HOI
Publication date	2005-07-08 (21.0 years ago)
Status	Current
Proponent / OPR	SAF/LL
Source of record	AF e-Publishing

Official document (AF e-Publishing)

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Nearby in the HOI series

HOI 65-6 — Insider Threat Resource Governance and Management Process Current
HOI 90-1 — Mission Directives and Current
HOI 90-2 — Operating Instruction (hoi) Program Current
HOI 90-41 — And Appropriations Act Reports Current

This is an unofficial index built from the public catalog. The controlling copy is always the one on AF e-Publishing — verify there before citing HOI 90-4 in an official product.