If you go to marinetraffic.com and look at a military port like San Diego you'll see plenty of military ships (for example https://www.marinetraffic.com/en/ais/

If you go to marinetraffic.com and look at a military port like San Diego you'll see plenty of military ships (for example https://www.marinetraffic.com/en/ais/home/shipid:5892129/zoom:13 https://www.marinetraffic.com/en/ais/home/shipid:5892129/zoo...). Sometimes they spoof, but often they don't, and the trackers show them even when they're spoofing.