One of the tier 1 naval promotions is Bombardment. The description says "+7 Combat strength vs. district defenses". AFAIK, the city center is not considered a district, therefore the only district that has district defenses is the encampment. That means that you only get that +7 when engaging the defenses of an encampment... With a naval unit! Which might happen about... twice per game if you're very lucky? Is this the worst promotion ever or am I missin something here?