Question: What sea did the first African-American aviator from North Omaha, Nebraska  member of a group of African-American military pilots who formed the 332nd Fighter Group and the 477th Bombardment Group of the United States Army Air Forces, go missing over?

Context paragraphs:
Sierra Bombardment Group: The Sierra Bombardment Group was a provisional United States Army Air Corps organization.  It was established on 8 December 1941 at Minter Field, California.  It consisted of air crews and ten B-17E Flying Fortresses formerly assigned to the 7th Bombardment Group 32d Bombardment Squadron and 427th Bombardment Squadron.  In addition, thirty five B-25 Mitchell medium bombers of the 17th Bombardment Group, Second Air Force, Pendleton Army Airfield, Oregon, were also assigned.

Alfonza W. Davis: Alfonza W. Davis (November 23, 1919 - October 30, 1945) was the first African-American aviator from North Omaha, Nebraska to be awarded his "wings."  He was a member of the Tuskegee Airmen, a recipient of the Purple Heart, Distinguished Flying Cross and the Distinguished Unit Citation.  Davis was assumed to be dead after going missing on or about July 30, 1945 over the Adriatic Sea.

847th Bombardment Squadron: The 847th Bombardment Squadron is an inactive United States Army Air Forces unit.  Its last assignment was with the 489th Bombardment Group at Great Bend Army Air Field, Kansas where it was inactivated on 28 March 1945.  The squadron performed antisubmarine patrols in 1942 and 1943.  After reforming as a heavy bombardment squadron, it engaged in combat in the European Theater of Operations until returning to the United States in late 1944.  The squadron was inactivated while its parent group was training as a very heavy bombardment unit.

Freeman Field mutiny: The Freeman Field mutiny was a series of incidents at Freeman Army Airfield, a United States Army Air Forces base near Seymour, Indiana, in 1945 in which African American members of the 477th Bombardment Group attempted to integrate an all-white officers' club.  The mutiny resulted in 162 separate arrests of black officers, some of them twice.  Three were court-martialed on relatively minor charges.  One was convicted.  In 1995, the Air Force officially vindicated the actions of the African-American officers, set aside the single court-martial conviction and removed letters of reprimand from the permanent files of 15 of the officers.  The mutiny is generally regarded by historians of the Civil Rights Movement as an important step toward full integration of the armed forces and as a model for later efforts to integrate public facilities through civil disobedience.

618th Bombardment Squadron: The 618th Bombardment Squadron was activated in 1943 as one of the four squadrons of the 477th Bombardment Group, the first (and only) bombardment group in the United States Army Air Forces to include black pilots.  Members of the squadron participated in the Freeman Field Mutiny, protesting racial segregation in the military.  The squadron was inactivated in 1945 after the 477th became a composite group that included bombardment and fighter squadrons.

616th Bombardment Squadron: The 616th Bombardment Squadron was activated in 1943 as one of the four squadrons of the 477th Bombardment Group, the first (and only) bombardment group in the United States Army Air Forces to include black pilots.  Members of the squadron participated in the Freeman Field Mutiny, protesting racial segregation in the military.  The squadron was inactivated in 1945 after the 477th became a composite group that included bombardment and fighter squadrons.

Tuskegee Airmen: is the popular name of a group of African-American military pilots (fighter and bomber) who fought in World War II.  Officially, they formed the 332nd Fighter Group and the 477th Bombardment Group of the United States Army Air Forces.  The name also applies to the navigators, bombardiers, mechanics, instructors, crew chiefs, nurses, cooks and other support personnel for the pilots.

Henry A. Norman: Major Henry Arthur Norman was among the first African American military pilots during World War II.  Although a member of the 598th Field Artillery Battalion (and not the famed 332nd Fighter Group or 477th Bombardment Group), he trained at Tuskegee and is generally counted among the Tuskegee Airmen.  A career military man, he served as part of the peacetime occupation forces in Germany, seeing armed combat again during the Korean War.  He eventually becoming a commissioned officer during an era in which that was rare for African-Americans, overseeing the 20th Army Air Corps.  After a rescue mission following the North Sea Flood of 1953 he was personally presented an award for meritorious conduct by the Queen of the Netherlands.  Following an honorable discharge from the Army, he earned a PhD in Education from the Ohio State University, and became the principal of the Lincoln School in Gallipolis.  He was a direct, male-line descendent of black Revolutionary War hero Bazabeel Norman.

Hiram Mann: Hiram Mann (May 23, 1921 – May 17, 2014) was an American aviator, retired lieutenant colonel in the United States Air Force, and member of the Tuskegee Airmen's 332nd Fighter Group, an elite squadron of African-American airmen during World War II.  Mann flew forty-eight missions over Europe as a member of the 332nd Fighter Group during the war.  Mann was a member of the "Red Tails," as the Tuskegee Airmen were called at the time, so-called because the tails of the P-51D Mustangs flown by the African-American pilots in combat missions were painted crimson red.  (The term "Tuskegee Airmen" did not come into use until the creation of a veteran's organization in 1972).  Mann nicknamed his own fighter plane "The Iron Lady" after his wife.

Robert B. Tresville: Robert B. Tresville Jr. (May 9, 1921 – June 24, 1944) was an African American pilot who served in the original 332nd Fighter Group of the United States Army Air Forces, also known as the Tuskegee Airmen, during World War II.  He was only the seventh African American to graduate from West Point.  He was Commanding Officer of the 100th Fighter Squadron and was widely considered to be one of the 332nd Fighter Group's most promising leaders.  He went missing in action after his plane went down over the Mediterranean Sea in June 1944.

Supporting paragraphs: Alfonza W. Davis Tuskegee Airmen
Answer: Adriatic Sea