Okay, I did some online research regarding Engineering Aviation Battalions during WWII that were on Okinawa. Here are the ones that I found (and a link where appropriate to more info about them). You can find all of the units listed on
http://www.cbi-history.com/part_iv_eng.html#12The 854th Aviation Engineer Battalion was on Okinawa at the end of World War II (15 August 1945 location). Inactivated 15 March 1946 on Okinawa.
http://www.military.com/HomePage/UnitPageFullText/0,13476,719424,00.htmlThe 813th ENGINEER BATTALION was constituted 17 November 1941 in the Regular Army as 813th Engneer Battalion, Aviation. Activated 15 December 1941 at McCord Field, Washington. Departed the San Francisco Port of Embarkation on 1 May 1942 and arrived in Alaska on 8 May 1942. Returned to Washington State; Redesignated 27 August 1944 as the 813th Engineer Aviation Battalion. Departed the Seattle Port of Embarkation on 25 April 1945 and landed in the Territory of Hawaii on 5 May 1945. Moved to Guam on 13 June 1945 and Okinawa on 5 July 1945. The unit was on Okinawa at the end of World War-II (15 August 1945 location). Served in the Army of Occupation of Okinawa from 15 September 1945-5 January 1946. Returned to the United States and inactivated on 7 January 1946 at Camp Stoneman, California.
Activated 25 September 1946 at Geiger Field, Washington. Reorganized and redesignated 27 June 1956 as 813th Engineer Battalion (Heavy Construction). Inactivated 16 December 1957 in Alaska. Withdrawn from the Regular Army and allotted to the Army Reserve, and assigned to United States Army, Alaska, 17 November 1960. Activated 3 January 1961 at Fort Richardson, Alaska.
http://www.military.com/HomePage/UnitPageFullText/1,13476,713742,00.html1878th Engineer Aviation Battalion
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 1 Mar 43 Richmond Army Airbase, VA
Inactivated: 24 Feb 46 Korea
Locations: Richmond Army Airbase, VA 1 Mar 43; San Francisco Port of Embarkation 16 Dec 43; Hawaii 20 Dec 43; Saipan 25 Jul 44; Okinawa 8 May 45
1884th Engineer Aviation Battalion
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 1 Apr 43 Geiger Field, WA
Inactivated: 21 Mar 46 Okinawa
Locations: Geiger Field, WA 1 Apr 43; Seattle Port of Embarkation 9 Jul 44; Hawaii 15 Jul 44; Anguar I 17 Sep 44; Guam 17 Dec 44; Okinawa 4 Jul 45
1885th Engineer Aviation Battalion
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 1 Apr 43 March Field, CA
Inactivated: 31 May 46 Okinawa
Locations: March Field, CA 1 Apr 43; Seattle Port of Embarkation 8 Jun 44; Hawaii 17 Jun 44; Guam 25 Aug 44; Okinawa 29 Jun 45
1886th Engineer Aviation Battalion
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 1 Apr 43 March Field, CA
Inactivated: 17 Jun 46 Okinawa
Locations: March Field, CA 1 Apr 43; Seattle Port of Embarkation 21 Sep 44; Hawaii 28 Sep 44; Guam 11 Dec 44; Okinawa –unknown
1889th Engineer Aviation Battalion (Colored)
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 1 Apr 43 Davis-Monthan Field, AZ
Inactivated: 28 Feb 46 Okinawa
Locations: Davis-Monthan Field, AZ 1 Apr 43; Seattle Port of Embarkation 21 May 44; Hawaii 28 May 44; Guam 25 Aug 44; Okinawa 15 Jul 45
1908th Engineer Aviation Battalion (Colored)
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 15 Oct 44 Greenville Army Airbase, SC
Inactivated: 17 Jun 46 Okinawa
Locations: Greenville Army Airbase, SC 15 Oct 44; Seattle Port of Embarkation 10 Mar 45; Hawaii 18 Mar 45; Saipan 24 Apr 45; Okinawa (Shipment #98721 unloading) 12 Aug 45
1909th Engineer Aviation Battalion (Colored)
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 20 Oct 44 Dale Mabry Field, FL
Inactivated: 17 Jun 46 Okinawa
Locations: Dale Mabry Field, FL 20 Oct 44; Seattle Port of Embarkation 16 Apr 45; Hawaii 23 Apr 45; Saipan 19 Jun 45; Okinawa Aug 45
1924th Engineer Aviation Battalion
Source: "World War II Order of Battle", Shelby L. Stanton, 1984
Formed: 9 Jul 44 Geiger Field, WA
Inactivated: 17 Jun 46 Okinawa
Locations: Geiger Field, WA 9 Jul 44; Departed ZI 3 May 45; Hawaii 10 May 45; Guam 25 May 45; Okinawa Jul 45
There was also a posting online as follows:
And that was the key that helped me find the treasure. The Air Force History Support Office (AFHSO) let me know via email that the history of my father's unit is indeed in the Air Force archives at Maxwell Air Force Base in Montgomery, Alabama.
http://robinchapmannews.blogspot.com/2011/04/something-dad-forgot-to-mention-about.htmlSo try the Air Force History Support Office for more info regarding your relative...they may be able to help you as well. This particular person even got a service photo of his.