U.S. Air Force flag manual (91 pages PDF)
U.S. Marine Corps flag manual (71 pages PDF)
U.S. Army flag manual (82 pages PDF)
U.S. Navy flag manual (106 pages PDF).
U.S. Coast Guard uses the Navy’s NTP 13 (B) with this additional material.
Nautical flag etiquette and protocol for civilians is addressed by the U.S. Power Squadrons, and may be found in detail here. Maritime or nautical etiquette can be quite different from ordinary civilian flag code, so this is so interesting for those of us who are land-locked.
If I have made any egregious errors with this material, don’t fuss and fume about it, but please, drop me a note.