Three He 112s were donated for rocket tests with the von Braun engine. Two were destroyed during testing, and the final aircraft made several flights using both propeller and rocker power. http://www.luft46.com/prototyp/he176.html http://www.astronautix.com/lvs/he112.htm Could He 112 have been developed further on? Also: http://www.airnews.co.za/?class=bb_content&method=view&global%5Bfields%5D%5B_id%5D=74
The Romanians used the He-112 in their airforce. This site has a picture of Pluto on one. http://ipmsstockholm.org/magazine/2004/11/stuff_eng_profile_farr.htm