There a numerous monuments and places named after Americans in Germany, some that come to my mind are:

There are monuments like the John F. Kennedy Platz (where he held the „Ich bin ein Berliner.“ speech, a bust of him in the library of the John F. Kennedy Institute at the Freie Universität (http://www.jfki.fu-berlin.de/en/information/) and the John F. Kennedy school all in Berlin. In Bonn there's the Kennedy Alley with a statue of him (https://de.wikipedia.org/wiki/Kennedyallee_(Bonn)#/media/File:Kennedyallee_Plittersdorf.jpg) and in Hamburg the Kennedy bridge.

Going back to Berlin there's the Clay Alley and at least two plaques of Lucious D. Clay (https://de.wikipedia.org/wiki/Datei:Gedenktafel_Platz_der_Luftbr%C3%BCcke_5_(Templ)_Lucius_Dubignon_Clay.JPG and https://de.wikipedia.org/wiki/Datei:Gedenktafel_Lucius_D_Clay.jpg). The Luftbrückendenkmal (monument for the air lift) also in Berlin has a plaque containing the names of the personnel who died during the air lift (https://de.wikipedia.org/wiki/Luftbr%C3%BCckendenkmal#/media/File:InschriftLuftbruckendenkmal.JPG). There was again in Berlin the Truman Plaza (where the German-American volksfest (probably best described as similar to a country fair) took place) and a couple of streets around the same area (where the American soldiers were housed until the end of the ocupation in the 90s) are named for Americans: Pritchardstraße, Ripleystraße, Stewardstraße, Taylorstraße and around the corner is the neighbourhood and underground station called Onkel Toms Hütte after fictional American character Uncle Tom: https://www.openstreetmap.org/#map=16/52.4503/13.2651&layers=N