CFR › Title 33 › Part 23Part 23 — Distinctive Markings for Coast Guard Vessels and Aircraft§ 23.01— Basis and purpose.§ 23.05— Where and when displayed.§ 23.10— Coast Guard emblem.§ 23.12— Coast Guard identifying insignia.§ 23.15— Coast Guard ensign.§ 23.20— Coast Guard commission pennant.§ 23.30— Penalty.