I suspect that this middle name is perhaps a family name; maybe a maternal line. Has anyone ever seen a Moeller or Kaiser with an ACE connection?
Adolph Moeller married Bertha Kaiser and they had two children that I have names on:
Roy ACE Moeller born 1910 in Howard county NE and Henrietta Doris Moeller born in 1917, same county. Henrietta said that her father was born in Ne., and his father was also. Makes me think the Moeller family was in the US for a long time. Bertha Kaiser was born in Germany, so doubt it is her line.