Philippines during Operation Downfall and Operation Olympic

I strongly suspect that the PCA would have committed to the invasion for two reasons.

1. The Allies were going to need all the men they could get.
2. Uncle Sam was footing the bill for equipment and supplies, as well as transport.

A secondary effect is that the more the PCA gets involved, the more equipment and supplies they get access to, and the more they will take home with them afterwards.

Remember, the Phillipines being bankrupt after the war has nothing to do with what was going on DURING the war.

Finally, once MacArthur kept his "I shall return" promise, there was a vast wellspring of affection for the US. (or at least that's what the history books I've read tell me) Cashing in on this would not be difficult, but it would take time. I wouldn't expect to see much in the way of troops until mid 1946, after the PCA has set up a training pipeline and started sending people through it.

Belushi TD

Do we have a orbat of the PCA at the end of the war of OTL so we can think what the PCA might bring into a invasion of Japan.

Well the Philippine Army Air Corps as of OTL May 15, 1945 consisted of the:

1st Air Engineering Squadron under Second Lieutenant Alejandro Ojeda, (non-flying support unit).

1st Air Materiel Squadron under Lieutenant Mariano Gomez, (non-flying support unit).

Both the 1st Air Engineering Squadron and the 1st Air Materiel Squadron formed the 1st Air Service Group of the Philippine Army. Because the PAAC lacked facilities and equipment, the units were attached to the U.S. Army Air Corps 5th Air Service Command for maintenance and operation at Nielson Field.

On September 1, 1945, the 1st Troop Carrier Squadron under Captain Roberto H. Lim was activated, making it the first of the post-war PAAC’s flying units.

If Operation Olympic happens as plan i can see the 1st Fighter Squadron formed in OTL on March 2, 1946 being formed in 1945, maybe a second fighter squadron as well.

They also could be expanded to have more than one squadron. 

I can see the Philippine Commonwealth Army not being used on the front line but used to police the areas behind the front line.

And they will need it if they going to fight on Japan itself.

One thing to keep in mind. The vast majority of the equipment that the Philippine army got in the 45 to 48 era was stuff that it wasn't worth shipping back to the US. The tanks, armored cars, jeeps, all that stuff, even the P-51s, were literally NOT WORTH shipping back to the US, because it would cost more to ship them back than sending a cargo ship back to the US empty, and there were huge stockpiles of these items sitting around waiting to get used.

Same thing going on in England in the last several months of the war. It was easier and cheaper to whistle up a few new P-51s from stores than it was to repair anything that had more than light to moderate damage.

Had the war gone on longer, the Philippines would have ended up as a FOB, as someone said up thread a bit. Once Japan finally gives up, the vast majority of the equipment and material will be cheaper to just give to the government rather than shipping back to the US. I'd even argue that the war continuing for another year or so would be better for the Philippines, as they would have another year of open purse strings from the US, and there would have been far more transfer of stuff and more employment of civilians by the US military. Once the war is over, the purse strings get tied shut.

Imagine it! The war goes on for another year, and all the various plans out there get completed. More cargo ships, more DEs maybe DDs, minesweepers... More planes, P-51s and C-47s.... More tanks, jeeps, stuff like that. Worst comes to worst, the government sells it off for scrap and has more cash to run the country. Maybe go the Russian route, demilitarize the tanks and turn them into tractors.

I suspect it likely that getting the Philippine Air Force into combat would be a "hearts and heads" kind of thing from a propaganda standpoint. "Look at us! We gave you your independence AND we are giving you the tools to fight your former oppressors!" Not to mention the harshness of the Japanese occupation meant that there were a LOT of people who would have been perfectly happy to go fight the Japanese.

The other thing to keep in mind is that there was at least one and maybe more Japanese armies still fighting on September 2, 1945 in the Philippines. Its entirely likely that these forces would continue to fight as long as the homeland had not surrendered. Lots of opportunity there for the new Philippine army to get trained and end up on the front line with the American army, not unlike the days of Battan in 1941/42.

Belushi TD