[jltsiren]

Look at the text of the Nicene Creed. There is a phrase that reads, depending on the translation, something like "one holy catholic apostolic church". That is the core of the issue.

All mainstream Christian denominations are branches of that original church. Some may see each other heretical, but they still acknowledge the common heritage. If you now have a religion that takes some aspects of Christianity, adds something of its own, and rejects the part all those schismatic branches agree on, it does not look like you are a branch of that "one holy catholic apostolic church".

The same applies to Jehovah's Witnesses.

[zzo38computer]

Your reasoning makes sense. However, it is not quite that simple.

As another comment mentioned, "and yet Jehovah's Witnesses are denoted on the list as a Christian faith".

So are Quakers (also denoted on the list as Christian), which (as far as I can tell) have no creed ; and, furthermore, although the Religious Society of Friends is Christian, not all Quakers are necessarily Christian (there are people of other religions as well, as well as those of no religion).

This does not seem to be specific to the DoD list; I have seen this in other lists as well.