LZs weren't much of an issue in the III Corps and IV Corps areas, but they did become problematic in some parts of II Corps (especially the Central Highlands) and I Corps (mainly as you got away from the coast). Eagle Flight type stuff worked really well in the first two CTZs, but not so well in II Corps or I Corps (at least away from the coast and much of the DMZ).
Not trying to quibble, but just pointing out how terrain can influence operational techniques.
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