I'm confused about that as well. I don't see any reason for the US to not test the delivery mechanisms, i.e. the ICBM and missiles. The ICBMs are being replaced

I'm confused about that as well. I don't see any reason for the US to not test the delivery mechanisms, i.e. the ICBM and missiles. The ICBMs are being replaced, so it would make sense to test those, but the Tomahawks and Trident missiles are tested frequently, the last Trident II being tested in September of this year.