#4 HB I think HB is heavy bombardment.
#5 "Nil", means no/none, nada. It is still frequently used in the military today as in the following context:" How many APC s are in your unit have cracked hulls?Nil returns need reply", which means, that even if the answer is none, you must still reply so the sender knows you actioned the origional question.
#7 FMN = formation
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