DA PAM 670-1: 4-1. Classification
Quick Answer
The Army Combat Uniform (ACU) and Improved Hot Weather Combat Uniform (IHWCU) in the Operational Camouflage Pattern (OCP) are daily work, utility, and field uniforms. Soldiers may wear OCIE in UCP, OEF-CP, and OCP patterns. Personal clothing items like the tan 499 undershirt, rigger belt, and coyote boots are authorized with UCP OCIE items.
Important
Unit and command policies may be more restrictive than AR 670-1. Always verify with your chain of command for local policies.
Official Source
View DA PAM 670-1, Section 4-1 (Pages 18-19)Full Details
4-1. Classification
a. The Army combat uniform (ACU) and the improved hot weather combat uniform (IHWCU) in the operational
camouflage pattern (OCP) is a daily work, utility, and field uniform (see fig 4–1).
b. Soldiers are authorized to wear OCIE (that is, field gear) in all three camouflage patterns: the universal camou-
flage pattern (UCP), Operation Enduring Freedom Camouflage Pattern (OEF –CP), and OCP. As UCP OCIE items become unserviceable and the onhand inventory is depleted, OCP OCIE items will be procured as replacements.
(1) Personal clothing items, such as the tan 499 (coyote) undershirt, tan 499 (coyote) rigger belt, and coyote combat
boots, are authorized for wear with the following UCP OCIE items:
(a) Army Aviation combat uniform, coat, and trousers.
(b) Combat vehicle crewman (CVC) uniform.
(c) Fuel handler’s coveralls.
(d) Mechanic coveralls.
(2) Insignia and accouterments worn on the OEF–CP and OCP OCIE items will be the corresponding pattern color.
Related Figures

Figure 4-1: Army combat uniform and improved hot weather combat uniform
DA PAM 670-1, Page 20
Figure 4-1 from DA PAM 670-1
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Disclaimer: This information is provided for educational purposes only. AR670.com is not an official U.S. Army resource. Always verify guidance with official publications and your chain of command.