My American born father, who has German ancestry was in World War II. He was one of many men held until their birth certificates could be checked out. People with German heritage like him, along Italians and several other nationalities, were treated this way. I have tried for over 30 years to get information unit info and the like. Over the years bits of information have some, and on occasion I was sent basic medals. But there is still nothing of where in New Guinea he or his unit was. I have heard that J. Edgar Hoover was responsible because of his fear of Germans. It was told to me by another researcher that the records of these military personnel was locked in his office, and thus were not lost in the St. Louis fire. It is surprising how many people do not know about this travesty.
Where can I find information on American born WWII soldier locked up until they could prove they had an American birth certificate?
6Please edit this; it's extremely difficult to understand what you are asking and what information you already know.– Steve BirdFeb 1, 2020 at 18:21
3What exact information are you looking for? Are you looking for information concerning the internment of German Americans, or are you looking for information concerning your fathers service records, which you seem to have obtained at least some of. If you wish information on activities while in New Guinea, we would need to know what information you do have concerning his unit. As mentioned above, some of your sentences are difficult to understand as written...– justCalFeb 1, 2020 at 19:12
Unsure exactly what information you are looking for, but for information concerning the internment of individuals of German and Italian heritage, it looks like this page at the National Archives might be the spot to start looking.
World War II Enemy Alien Control Program Overview
Immediately after the bombing of Pearl Harbor, President Roosevelt issued Presidential Proclamations 2525, 2526, and 2527 to authorize the United States to detain allegedly potentially dangerous enemy aliens. The FBI and other law enforcement agencies arrested thousands of suspected enemy aliens, mostly individuals of German, Italian, or Japanese ancestry, living throughout the United States.
Some information concerning the internment itself:
By the end of the war, over 31,000 suspected enemy aliens and their families, including a few Jewish refugees from Nazi Germany, had been interned at Immigration and Naturalization Services (INS) internment camps and military facilities throughout the United States. Some of these internment locations included Sharp Park Detention Station, California; Kooskia Internment Camp, Idaho; Fort Missoula Internment Camp, Montana; Fort Stanton Internment Camp and Santa Fe Internment Camp in New Mexico; Ellis Island Detention Station, New York; Fort Lincoln Internment Camp, North Dakota; Fort Forrest, Tennessee; and Crystal City Internment Camp, Kenedy Detention Station, and Seagoville Detention Station in Texas.
This page has numerous links near the bottom which may help guide your research, or provide the records you are looking for. (There are also some sources listed at the end of the Wikipedia article which may also offer some insight)