My concern is with MITRE's definition of "tactics" as "short-term, tactical adversary goals during an attack," which is oddly recursive.

The key word in the tactics definition is goals. According to MITRE, "tactics" are "goals."

ATT&CK lists the following as "Enterprise Tactics":

"Tactics, in warfare, the art and science of fighting battles on land, on sea, and in the air. It is concerned with the approach to combat; the disposition of troops and other personalities; the use made of various arms, ships, or aircraft; and the execution of movements for attack or defense...

The word tactics originates in the Greek taxis, meaning order, arrangement, or disposition -- including the kind of disposition in which armed formations used to enter and fight battles. From this, the Greek historian Xenophon derived the term tactica, the art of drawing up soldiers in array. Likewise, the Tactica, an early 10th-century handbook said to have been written under the supervision of the Byzantine emperor Leo VI the Wise, dealt with formations as well as weapons and the ways of fighting with them.

The term tactics fell into disuse during the European Middle Ages. It reappeared only toward the end of the 17th century, when “Tacticks” was used by the English encyclopaedist John Harris to mean 'the Art of Disposing any Number of Men into a proposed form of Battle...'"

From these three examples, it is clear that tactics are about use and disposition of forces or capabilities during engagements. Goals are entirely different. Tactics are the methods by which leaders achieve goals. 

I was not a fly on the wall when the MITRE team designed ATT&CK. Perhaps the MITRE team fixated on the phrase"tactics, techniques, and procedures," or "TTPs," again derived from military examples, when they were designing ATT&CK? TTPs became hot during the 2000s as incident responders drew with military experience drew on that language when developing concepts like indicators of compromise. That fixation might have led MITRE to use "tactics" for their top-level structure. 

It would have made more sense for MITRE to have just said "goal" or "objective," but "GTP" isn't recognized by the digital defender world.

Some readers might think "ATT&CK isn't a military tool, so your military examples don't apply." I use the military references to show that the word tactic does have military origins, like the word "strategy," from the Greek Strategos or strategus, plural strategoi, (Greek: στρατηγός, pl. στρατηγοί; Doric Greek: στραταγός, stratagos; meaning "army leader"). 

That said, I would be surprised to see the word tactics used as "goals" anywhere else. For example, none of these examples from the non-military world involve tactics as goals:

This Harvard Business Review article defines tactics as "the day-to-day and month-to-month decisions required to manage a business."