I just asked a native Spanish speaking friend about this and was told: The ocean is masculine so in speaking of the ocean as a noun or adjective use Pacifico. When using an adjective when speaking about a man use "Pacifico". When using an adjective for a woman use "pacifica". So it does seem the church's usage is incorrect unless "Base" or "Bridge" are feminine. This was in the late 70s and the immigration issue wasn't really a big deal until the 1986 amnesty. There were very few hispanics on staff in PAC. They did start to bring South American staff on base for the New World Corp training, I believe, around 81-82 but that is another story. Honestly, I think they just wanted to use "Pacifica" because it sounded fancier than "Pacific" and they couldn't find anything else that was better no matter how hard they tried. I'm not sure when they formally adopted the name but at some point LA became the largest Mexican demographic outside of Mexico City so in retrospect someone, (and there really is only one person who would do this), may have just realized that old survey just caught up to reality so, go with it.