ORIGINAL: crsutton
I have not seen statistics but I think you are right in assuming that. Even in Europe mediums were not direct ground support aircraft. That was just not what they were designed for. I don't think even strafers were intended for direct ground support.
The bombers of the 5th Air force were not used as they were designed for. They were heavily modified in equipment
and tactics.
Lae, New Guinea, September 4th 1943:
The following day, B-24s attacked Lae from altitudes greater than 11,000 feet. B-25D-1s hit the landing-beach
grounds northeast of Lae, attacking from 300 feet and below expending 20,500 rounds of .50-caliber ammunition
to suppress enemy fire. Because the attacks predated the full incorporation of parademos into the Fifth’s
inventory, low-altitude attackers used demolition bombs with delayed-action fuses. The 3d Attack Group employed
60 300-pound weapons equipped with four-to-five-second-delay fuses against the landing beach on 4 September. Much
like the mast-height attacks in the Battle of the Bismarck Sea, the delays allowed aircraft enough time to exit
the detonation area after release. Furthermore, the loosely packed beach sand helped inhibit any skipping
tendencies of the weapons. A-20s followed the B-25s, laying down a screen of smoke to protect the Allied landings
on the beach. Like the day before, on 5 September—the main day of the operation—A-20s were used primarily to
create a smoke screen for American and Australian paratroopers landing at Nadzab, approximately 15-20 nm
west-northwest inland from Lae. Combined with a low-altitude paradrop—the first airborne operation in the
Pacific—the operation featured extraordinary coordination between light bombers and cargo aircraft, producing
some of the more recognizable photographs of the war. Twenty-four B-24s and one B-17 dropped 188 1,000-pound
bombs on a nearby plantation (occupied by the Japanese) to prevent enemy reinforcements from reaching the drop
zone. Sixty-four B-25s from the 38th and 345th BGs dropped just over 3,200 20-pound fragmentation bombs as well
as 420 23-pound parafrags, and expended over 60,000 rounds of .50-caliber ammunition as they strafed the landing
zone in 16-abreast formation. Finally, seven A-20s from the 3d Attack Group surrounded the Allied drop zone in
a thick veil of smoke. By the afternoon’s end, over 1,700 paratroopers were safely on the ground.
The Philippines, 1945:
With the invasion of the Philippines, low-altitude work again took center stage. The Philippines campaign tied
Fifth Air Force’s bombers closely to the ground offensive: “They just paralyzed all movement on all the roads,
and there wasn’t a locomotive in the Philippines that was running; they were all full of holes. They blew up
railroad tracks and destroyed bridges. The armored crowd—of course, their particular target for a while was
Yamashita’s armored division, which we didn’t want to get moving around, because an armored division is a nuisance
to have fiddling around with your advance—and their armored division never moved. It was stopped right where it
parked.”{224} At times, bombers acted at the direct behest of ground troops in what could be called close air
support. On 17 March 1945, for example, a B-25 of the 499th BS was called off its mission by ground
troops: “Ground Forces requested a/p to knock out enemy tank in house which was holding up advance.
House was strafed with 1200 x 50 cal resulting in a large fire and explosion with black smoke. Tank was
destroyed and Ground Forces congratulated pilot on excellent job done.”{225} Attackers and bombers not
otherwise assigned to fixed targets or ground-support missions performed opportunistic interdiction attacks.
Rodman , Captain Matt: A War of Their Own: Bombers Over the Southwest Pacific [Illustrated Edition] Verdun Press.