In regards to your questions about D-day: The invasion was multi-national. so not all of the beaches fell under the first U.S. Army control. All invasion ground forces were initially under the command of British General Sir Bernard L. Montgomery. Under him were the British,Canadian, and U.S. Forces. The U.S. contingent (1st U.S. Army) was under the command of general Omar Bradley. As more U.S. came ashore, the 1st U.S. Army was given to General Courtney Hodges and Bradley moved up to command 12th Army Group. But during the invasion, the 1st Army consisted of 2 Corps commands. The VII Corps landed on Utah Beach under the command of General J. Lawton Collins, whose mission it was to link up with the airborne forces and cut the Cotentin peninsula entirely and facilitate the capture of the port of Cherbourg, which the Allies needed to feed the enormous amount of supplies needed. The V Corps landed at Omaha Beach under the command of General Leonard Gerow, assigned the task of consolidating and linking up with VII Corps on its right flank and British forces on the left flank, before driving inland.The beaches assigned to the British and Canadian forces were Gold, Juno, and Sword.The primary Infantry forces were that of the 1st Infantry Division, 4th Infantry Division, 29th Infantry Division, and Ranger forces. _http://www.web-birds.com/9th/48/d-day,%20order%20of%20battle.jpg_ (http://www.web-birds.com/9th/48/d-day,%20order%20of%20battle.jpg) Of course they were many supporting units(including Naval), attached at the Regimental,Division, Corps, and Army Levels to facilitate the landings. The mulberries were constructed after the beaches were secured by invasion forces to unload supplies, reinforcements, and evacuation of casualties. During the fall of 1944, as the allies were moving eastward, reinforcements and replacement vehicles were becoming harder to find. The U.S. solved this logistical challenge by stripping personnel and vehicles from units it thought it could spare at the time, since the Germans were on the defensive and withdrawing rapidly. This did include AAA units. Airfield A-92(Which was B-62 until 9/18/44) was located at St. Trond, Belgium which was assigned to the 9th Air Force. Units at this base were: 48th Fighter Group 9/44-3/45 404th Fighter Group 10/44-3/45 9th Weather recon Squadron 4-6/45 386th Bomb Group 4-7/45 This sector was within the boundaries between the 9th and 1st U.S. Armies and the 397th probably had corps or army level attachments. It is very possible that the batteries that made up the 397th could have had different attachments.This link with a unit contact may be helpful: _http://anyboard.net/gov/mil/omaha/posts/507.html_ (http://anyboard.net/gov/mil/omaha/posts/507.html) Rick