I don't believe anyone would have written this in 1972. It would have been, "...pilots who have rotated...."
As one who grew up with "who" and "whom," I react sharply to the latter-day error of substituting "that." Thus I was struck by phrasing in the "memo" of August 1, 1972, "... qualified Vietnam pilots that have rotated...."I don't believe anyone would have written this in 1972. It would have been, "...pilots who have rotated...."
Maybe not in 1972, but how about these lines from Shakespeare?
HAMLET: My fate cries out,
And makes each petty artery in this body
As hardy as the Nemean lion's nerve.
Still am I called. Unhand me, gentlemen.
By heaven, I'll make a ghost of him that lets me!
Hamlet, Act I, Scene iv, lines 81-5.
Good to cross paths with you, old friend.
You are very observant. Good catch. FReepers are good at what they do.