[Ol' Dan Tucker]

Men will remove their hats when in service at the church I attend, cancer or not.

Does your church have a specific, written dress code that says this?

Really?

What denomination?

[so_real]

This is not a ground breaking new tradition. It's embraced by Catholics, Protestants, and Lutherans alike. Read up : https://www.google.com/#q=remove+hat+in+church and you'll even discover Biblical precedent : http://www.openbible.info/topics/wearing_hats.