Here's a few good one's from the Australian War Memorial archives website.
https://www.awm.gov.au/search/all/?quer ... ist&filter[related_units]=49+Fighter+Group+USAF
Australia: Northern Territory, Darwin
7 September 1942
"American airmen flying Curtiss P-40 Kittyhawks of the 9th Pursuit Squadron, 49th Pursuit Group United States Army Air Corps (USAAC) based at Darwin. Identified flyers are; Lieutenant R Taylor from Missouri, Captain B S Irvine of Georgia, Lieutenant Robert M McComsey of Pennsylvania, Lieutenant C L Patterson, Lieutenant J C Peasles, Lieutenant A J Reynolds of Oklahoma."
https://www.awm.gov.au/collection/F01778/"The 49th Fighter Group USAAF stationed in Darwin area. Aircraft flying in formation, low flying for anti-aircraft defence practice. Personality shots of American fighter pilots. Names in order of shot; Lieutenant (Lieut) J Reynolds of Oklahoma, Captain J Hennan of Minnesota, Lieutenant James Morehead of Oklahoma, Captain George Kiser of Kentucky. Lieut Hennan and Lieut Morehead of the "Caterpillar Club" congratulate each other. The "Caterpiller Club" is for anybody saved by a parachute jump. Scenes of USAAF Curtiss P40 aircraft and various aircraft nose art."
https://www.awm.gov.au/collection/F01187/and some A-20's in color.
"This film was taken in late 1942 at '3 Mile' also known as Kila Kila Aerodrome and the home of the 89th attack Squadron (Douglas A-20s), 3rd Bomb Group, USAAF."
https://www.awm.gov.au/collection/F03704/