Of course it needs some translation, but not necessarily an equivalent. May be this acronym is known in English, but only in a few select countries. Many people reading articles in another language will just wonder what it means or why it is there.
If you're speaking about some Emergency team, jsut name it correctly, instead of using vague allusions that are country and language specific. And even if you think this is a sense of humour, this is not shared across the world and culture.
For example, almost nobody knows that acronym in France, or may be confusing it with other English terms (I know some of them associate it to some meaning related to spider or spider webs, or some 6-feeted bugs, or bees, or confuse it with some terrorist group, and don't even think this is a special police force). If we were looking for some equivalent of SWAT in France we would use "GIGN", do you really think I'd ask you to keep it in English??? But then people would also wonder why we associate them to some Wikimedia project, even if it's technical and limtied in scope (but this limtied scope is even farther from the activities of the real SWAT).
The simpel fact of associating the name of an official enforcement force to these independant volunteered projects is a bad idea I think. And beware of homour, it mayu be fun in sopme context when you know what is your public, but here it is very bad in a context where you ask for translations for use worldwide. Even when you use a wellknown international brand name, it must be done accurately on topic.