О нашел
"As the division, now in clear weather, approached its target, it came under exceptionally heavy attack by crack Luftwaffe day and night fighters concentrated for the defense of Berlin. Howard released squadrons and flights of his P-51s to defend the bomber stream while he climbed to meet attacks against the lead box of bombers. He immediately shot down a twin-engine Messerschmitt Bf-110 night fighter. After that initial engagement, he found himself alone, confronted by some 30 Luftwaffe fighters whose attacks were centered on the 401st Bombardment Group.
Rather than waiting to reassemble some of his P-51s, Howard took on the swarm of Bf-109s, FW-190s, and Bf-110s single-handed. In a violent, exhausting, climbing-diving melee that lasted for 30 minutes, he shot down three enemy aircraft, scored one probable, and damaged at least two others. Howard continued the fight until he was out of ammunition, then broke up enemy attacks on the bombers by diving at incoming fighters until his fuel was dangerously low and there were no more bandits in sight. By that time, the 401st had bombed its target successfully and had begun the long return flight to England. Not one of the group's B-17s was lost during Jim Howard's epic battle against overwhelming odds.
When Howard landed at Boxted, there was one bullet hole in the wing of Ding Hao!, his P-51, and that a stray .50-caliber from one of the B-17s.
The 401st Bombardment Group, whose crews were astounded by the skill and heroism of the "One-Man Air Force" who had defended them, finally ran down his identity and sent to Washington a recommendation for award of the Medal of Honor. Gen. "Tooey" Spaatz, Commander of US Strategic Air Forces in Europe, presented the medal to Jim Howard, the only fighter pilot in the European theater to be so honored."
http://www.afa.org/magazine/valor/1183valor.asp
То есть он подбил 3, 1 возможно и 2 повреждено ..Кстати дрался он один против Bf-109, Fw-190, Bf-110 количеством 30 штук..
И еще:
"he downs two Bf-110s and an FW-190 (and probably downs another FW-190) "
http://www.354th.com/Missions/missions_pt_2.htm
Значит официально он подбил два Bf-110 один Fw-190 и возможно еще один Fw-190.. Плюс два поврежденных о которых говорилось ввыше..