Were the Late roman Auxilia German?

[sonic]

Before I go off on one of my (only very occasional!) rants, I would like to ask everybody the following question:

What is the evidence for the Late Roman Auxilia (say, from the time of Constantine I onwards) being almost entirely German?

I have my own viewpoints and evidence, but would prefer others to have their say first so that I can agree with/disagree with their comments without having to post an entire dissertation to support my views first.

I hope nobody minds, but I have extremely limited time available to go online and can reply to points quicker and - hopefully - in a clearer manner this way!

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Ian (Sonic) Hughes