Often times, I see parenthetical phrases or sentences that kind of add information or clearify the meaning of words or the main sentences. Please tell me what are the rules for that? Are the OK as long as they make sense? Articles always absent?
eg,
DMZ (last front of the Cold War)
... Application form (Form will be mailed out)
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It's hard to tell with such brief examples, but in general, I'd say that the articles would be preferred. Unless the second one is in bullet/point form, in which case articles are often dropped.