[Chuckster]

Does the Navy swap those letters in their code compared to the international code?

Could be. I was not in the Navy, but I am a sailor. IIRC, the US Navy military code is slightly different from the international code standard. I could be wrong.

[LonePalm]

The flags are the same.

The meaning of flag groups can vary depending on the situation.

My favorite is Oscar at the dip. Oscar flown alone indicates a man over board. Any signal flown at the dip (1/2 to 2/3 of the way up) is a preparatory signal. When the signal is closed up is the sign to execute the command. Oscar is always kept bent on (attached to the halyard) but still in the flag locker while underway. This means it can be hoisted at a moment's notice.

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)