I want to know the answer to the following question:
Which branch of the military was Lieutenant Thomas Selfridge in?
All the background I'm provided with is that "Bell was a supporter of aerospace engineering research through the Aerial Experiment Association (AEA), officially formed at Baddeck, Nova Scotia, in October 1907 at the suggestion of his wife Mabel and with her financial support after the sale of some of her real estate.". Is that enough to answer the question?