All US Military units use them, pilots flying their jets might be called, "Able Baker 5 this is Alpha 3, over...", US Navy warships operating off North Vietnamese Coastlines were often "Yankee Station...", US Warships off of the South Vietnamese coastlines were often "Dixie Station...". We use those "call signs" for military security reasons; the enemy is always listening.
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They called the Confederate soldiers the Rebels or "Rebs"
Fierce.
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I know of many that called them krauts.
You can see a list of top Wehrmacht Soldiers on the link below and other links.