SOUTH PACIFIC THEATER OF OPERATIONS (Thirteenth Air Force) The invasion of New Georgia Island begins with amphibious landings by US Army and US Marine Corps forces on Rendova. Subsidiary landings take place at other points in the New Georgia area. USAAF and other allied fighters cover the landings. At 1100 hours, 30+ Zekes attack the beachhead; Allied fighters intercept, claiming 16 shot down. At 1500 hours, a large force of fighters, dive bombers, and torpedo-carrying bombers attack the vessels of the Task Force which is handling the landings. F4U's, F4F's and AA down all the torpedo-carrying bombers as they attack vessels however, a torpedo strikes the flagship, the attack transport USS McCawley (APA-4), amidship severely damaging the vessel (later mistakenly sunk by US PT boats). Early in the evening about 30 more Japanese aircraft return to the assault area. Allied fighters claim 18 of these shot down. B-25's and US Navy dive bombers bomb Munda Airfield. A B-24 strike on Kahili aborts because of bad weather. Lost is B-24D Liberator 42-40254.
Amplifying the above:
In Operation TOENAILS, the USN's Task Force 31, supported by land-based Allied aircraft, lands the 172nd Infantry Regiment of the 43d Infantry Division, on Rendova Island in the Solomon Islands; two companies of the 169th Infantry Regiment are also landed on two small islands bracketing the passage through the coral reef to the future landings on New Georgia Island. The 4th Marine Raider Battalion, which had landed at Segi Point on Vangunu Island off the southeast coast of New Georgia Island on 21 June, marches overland to seize Viru Harbor on the southeast coast of Vangunu.
At 1530 hours local, 49 IJN aircraft attack the retiring USN invasion; the attack force consists of 24 torpedo carrying "Betty's" escorted by 25 "Zero's" One "Betty" launches a torpedo that hits the attack transport USS McCawley, the force flagship, in the engine room, killing 15 of her crew, and knocking out all power. The ship is taken under tow but at 1640 hours, all the crew except the salvage party is taken off. At 1730 hours, 30 IJN fighters attack the invasion force and the McCawley is strafed by not damaged. At 2023 hours, the ship is struck by another torpedo and sinks in 30 seconds. The following day, it was learned that six USN PT boats had torpedoed an "enemy" transport in Blanche Channel, after having been informed there were no friendly forces in the area.
SOUTHWEST PACIFIC THEATER OF OPERATIONS (Fifth Air Force) Allied amphibious forces begin landings, unopposed, at Nassau Bay during the night of 29/30 Jun. Forces push N and S toward the Bitoi River and Tabali Creek, respectively. Troops make contact with enemy forces in the Cape Dinga area S of Nassau Bay. Australians open the assault on Bobdubi Ridge and maintain pressure on the enemy in the Mubo area. B-25's pound Bobdubi Ridge in support of the assault and hit forces at Logui and Salamaua. B-25's also bomb the airfield at Cape Chater on Timor Island. 43rd BG B-24's and B-17's bomb an airfield at Rabaul, lost is B-17F "Pluto" 41-24543. One heavy bomber scores a hit on a cargo vessel off Cape Gloucester. The 57th Troop Carrier Squadron, 375th Troop Carrier Group arrives at Port Moresby from the US with C-47's.
Amplifying the above:
In Operation CHRONICLE, the USN's Task Force 76 lands the 112th Cavalry Regiment and the 158th Infantry Regiment, on Woodlark and Kiriwina Islands in Nassau Bay respectively. At the same time, the 1st Battalion, 162d Infantry Regiment lands in Nassau Bay. Airfield construction soon begins on Woodlark Island.
The landing on 30 June 1943 at Nassau Bay was by a battle group based on US I/162nd Bn. So far as I am aware, there was only one Australian with the landing force (Capt McBride AIF, a liaison officer from General Savige's HQ) and his landing craft did not actually make it until the following night, so the landing was actually an all-US affair.
However, Australians were on-shore to guide the landing craft in. I recall the landing craft were supplied by the 532nd Engineer Boat and Shore Regiment, part of the US 2nd Engineer Special Brigade. Many were destroyed in the exceptionally high surf (fortunately with no loss of life). This influenced General Blamey's subsequent decision to discard Nassau Bay as a staging area for Operation Postern (the capture of Lae).
I/162nd Battalion was commanded by Lt-Col Harold Taylor. I believe the battalion earned a Presidential Unit Citation for its subsequent work in the liberation of Salamaua. It is now part of the Oregon National Guard. "Mackechnie Force" initially referred to the balance of 162nd Regiment (II and III battalions plus attached AAA units and arty). Taylor's I battalion was detached as part of 17 Bde AIF (u/c Brigadier Moten) but was later restored to Mackechnie Force. Mackechnie Force was briefly referred to as "Coane Force" when commanded by Brigadier Ralph Coane but reverted to its former name on Col Mackechnie's return on 13 Aug 43.
Simultaneous landings took place on 30 June 1943 on the Trobriand Islands (Kiriwina and Woodlark) by RCTs from US 6th Army, however both islands were already occupied by Australian forces (a radar station, infantry and native forces). Unfortunately, neither the US landing forces nor the incumbent Australians were advised of the other's presence! Fortunately, good luck and common sense on both sides prevented any "blue on blue" incidents.