MCWP 6-22, Communications and information Systems, provides the doctrine and tactics, techniques, and procedures for the conducting of communications and information systems across the spectrum of Marine air-ground task force (MAGTF) operations. Marine Corpse Reference Publications (MCRP) 6-22C, Radio Operators Handbook, complements and expands upon this information by detailing doctrine, tactics, techniques, and procedures for operating signal-channel high frequency (HF), very high frequency (VHF), and ultrahigh frequency (UHF) radios. The primary target audience for this publication is Marine Corps radio operators and other users of signal channel radios. Marine Corps Warfighting Publication (MCWP) 3-40.3B is an update to MCWP 6-22C.