 Complete the following phrase:  On 10 May the Dornier units, Kampfgeschwader 2, KG 3 and KG 4, were under the command of Fliegerkorps. II. Kampfgeschwader 76 and 77 also operated the Do 17 under Fliegerkorps I and Fliegerkorps VIII. The Do 17 saw its usefulness diminish during the French campaign owing to its limited bomb load and range. The design continued to be favoured by the Luftwaffe aircrews, as it was more maneuverable than the He 111 or Ju 88, and because of its ability to perform low-level strikes well. An example of this was a raid carried out by KG 2 against the RAF-controlled airfield at Vraux on 10 May. Six Bristol Blenheims and two Fairey Battles of No. 114 Squadron RAF were destroyed, with many more damaged. However, Allied fighter resistance on the first day was severe, and KG 2 and KG 3 of Fliegerkorps II lost a total of nineteen Do 17s between them on 10 May. Only two weeks into the campaign, KG 2 and 3 suffered fuel shortages, keeping the Dorniers grounded and forcing some attacks to be aborted. By the beginning of June, the Dornier Geschwader were encountering less opposition and losses declined sharply, as the Armée de lAir was no longer a sufficient threat. However, over 