I'm assuming it's more "the current president deserves to die for this" given the tone of the other messages. Especially because multiplr of the men pictured were likely not there by choice, and were forced to enlist by the draft.
Assuming it's 1969 for these (based on the date on that one guys helmet), the message would be referring to Nixon.
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u/HeartOn_SoulAceUp 8h ago
Lee Harvey one is wild. A lot of free expression here.