Jerry Noble, the Yankee Eagle, is an agent of the U.S. Naval Secret Service.
At least that is what it is written about him at the end of his illustrious career, i.e., the last recorded adventure we have of him. Prior to that he is apparently an independent adventurer who invariably finds ways to help out his country in defending itself against both German and Japanese agents (not specifically identified as such, of course, because these activities take place before America was drawn into the soon-to-be world war).
When we first meet Noble, he is having a bit of trouble with a D.C. policeman for having a caged bald eagle in his car. Except that he could prove the cage was empty and it was he that was speaking 'eagle'. It is that encounter where we learn that Noble can "imitate any animal on earth" and who "can make eagles and sheep and wolves and chickens get along". He does this, he indicates, on his ranch "out west", a facility he owns thanks to being left "an independent fortune" by his late mother.
All of this is "kid stuff", in the words of his initially irritated father, a prominent Senator but Noble, incensed by having his talents belittled proceeds to show his moxey and the value of his communication skills by finding and rescuing a stolen U.S. destroyer. This detective work comes with the invaluable aid of his favorite animal friend, Sam the bald eagle. Well, him and a flock of sea gulls Noble convinces to help dive bomb the hijackers.
After that escapade, which Noble wants to be kept quiet but which I would guess his father learned of anyways, Noble becomes the man to call by the Senator and later other officials when things get dicey and extraordinary assistance is needed.
In several of the remaining adventures we have, Noble's allies are "all the birds and beasts of the land, whose language he understands and imitates so well that he can talk to them just as you and I talk to another human being". First and foremost among these allies is, as I said, Sam who is not only Noble's good friend and companion, he also delivers messages to Noble from the Senator (no idea how the Senator lets the eagle know there is a new message to be delivered, though).
In addition to being in tune with animals, Noble is also a skilled ship operator, whether it be a sailboat or a large destroyer. He is also an accomplished pilot, so much so that he is able to engage in high-speed dogfights.
The animal communications ability plays a major role in the actions of Noble in all the adventures except the last, as follows:
1 = Sam the eagle and a flock of seagulls
2 = Sam the eagle and an injured puma
3 = Sam the eagle, a few sea lions, a crew of monkeys manning a destroyer
4 = Sam the eagle and a ?chimpanzee? (hard to tell) who is on the bad guy's side.
5 = Sam the eagle and a billy goat
6 = Sam the eagle, the puma again, a cage full of rats, and then some cave owls
7 = A little mouse
8 = no animals
What happened to Sam in the last two adventures is not explained. Indeed, in that final escapade, there is no mention whatsoever to Noble having any extraordinary communication skills whatsoever, being now treated as an enterprising albeit normal government agent.
Note: it must be pointed out that this individual, Jerry Noble, the Yankee Eagle, is from everything I can find absolutely not connected with who also goes by the nickname of the Yankee Eagle. Granted, both are Americans and both work on occasion for some branch of the American government and both had their adventures recounted in the same magazine, albeit a year apart from each other. But these two Noble fellows are not related.