Don’t let this happen to you. The makers of this patch obviously don’t read Arabic. They got the word right, al-kafir, and it’s spelled right, but unfortunately at some point it was copied-and-pasted into an incompatible system and the letter order was reversed. So it essentially reads r-i-f-a-k-l-a. I’d also have left of the al-.
If you’re wearing it to be funny, it couldn’t be funnier. But the military coloration makes me think it’s mean to be badass, so it probably shouldn’t make the Arabic reader giggle.
The photo is from eBay, where you can pick up one of these if you’re interested.