The later books have got month markers at the top of chapters that start in a new month. The earlier ones don’t, but for the most part they don’t overlap. The ones that do overlap are At All Costs, War of Honor, Shadow of Saganami and Crown of Slaves. The five books after that – Mission of Honor, A Rising Thunder, Storm from the Shadows, Torch of Freedom and the forthcoming Shadow of Freedom all have month markers so there’s no reason to repeat chapters simply for orientation. If it’s useful for people who start reading with this book, then that’s different, but I’d agree that it deserves a separate treatment.