You should take off your kipa in an islamic country/war zone that idea I am pretty sure about! However to take off your kipa at a job site to cater to goyim or unreligious jews would be such a chillul hashem.

I still have an issue with the ideals of assimilation into this Christian country. The kipa/ head covering symbolizes that HaShem is above you, it symbolizes your humility. Your badge of honor takes a back seat to that primordial goal.

Also, you think a kipa is the only way Anti-Semites can tell if your Jewish? People judge by names, appearance, as well as attire.

Kudos to you, Seth on this article. Well said.