I’m familiar with communications in which something such as a specific word would be used as a delimiter to alert specific message targets that what is contained between the delimiting words is authentic and official, needing highest priority action. That would explain the comma after Q. I.e. "Delta" both starts and stops the meat of the message in that everything between those two uses of "Delta" is of supreme importance.
It’s also possible that delimiter serves a double purpose in that it is also an address word as well. In this case Delta is both the addressee, for example Delta Force, to whom the instructions and/or warning is sent, and the delimiter as well. Thus only Delta Force would take action on the message. . . Yet Able, Baker, and Charlie Forces would also know what’s going on.
That’s all a stretch, but a possible one.
Ummm....what HE said.
:)