At first, it looked like it was merely "at sea" maintenence painting, the pattern being small.
But, it was in all of the photos, and that kind of swayed me to "meant to" pattern.
However, a second stroll through the photos seems to show the pattern not being constant. It's also only on the superstructure, too; none on the hull at all. If it were a true
"tactical" paint job, I'm guessing the pattern would, 1, be larger, and 2, include the hull. Now, that is supposition on my part. And a little bit od experience with the catalyized acrylic paint which weathers (and applies) at all sorts of different rates and tones.
That, and the Spru-cans and Ticos are not much fun to keep painted at sea with those great bluff sides always a little bit in the weather while under way (or with a breeze blowing excess droplets off either on the pierside or on an adjacent vessel--who will have invariably a higher ranking officer aboard <g>).