Yup, Eureka's your place to be. The figures are suppose to be USMC but they are suitable for Army as well. The troops are armed with Springfields but at this scale you can't really tell with a quick look so they can work for US Army troops in the Philippines.
The Marine are spot on for the 1st Defensive Battalion on Wake and the 4th Marines/Special Weapons Battalion on Bataan and Corregador. The Lewis guns in the range were only used by the Navy and the USMC and the Thompsons are wrong. They should be using the round drum rather than the straight magazine. And the M1917 is perfect! The range also has a useful mortar and weapons crews along with command figures so it's a reasonably complete range. The only thing missing is the M1919 LMG which was used on the Philippines and maybe on Wake. Also the M1918 37mm infantry gun is missing too. But you can use the weapons crews for French 75mm and British 18lbrs and you have the American artillery in the Philippines.
The Cavalry is good but they have the men carrying rifles. According to sources out there the cavalry used their rifles on foot and pistols when charging. But the sculpts are still nice and need only a little cleaning up to use. Be warned, the top half of the troopers may need to be clipped so the figures mount correctly because the soldier's lower body is casted to the horse and the body above the waist is a separate piece.
The Philippine Army troops are great too! Their kit is spot on and you even have some of them using bamboo sticks to eject spent brass because the extractors on the M1917 Enfields were broken on many of the issues rifles so the sticks had to be shoved down the barrel to clear the chamber. So in effect you have soldiers standing with these poles down the barrel looking like Civil War era soldiers reloading! Very nice touch. The only problem is that all you get are riflemen. There are no heavy weapons, such as they were, for these guys. However I can see some head swaps with the Marine range to fill in some gaps like the M1917 and BAR.
The guys above didn't mention that there's a small Navy range too. This line has men in Navy uniform carrying rifles and some carrying Thompsons. I don't know how accurate that is as I haven't seen any mentioning of the Thompson being used by anybody on the Philippines but by the Army and the USMC. Eureka USA sells these guys in squad packs with a couple of officers and Thompsons and about six rifles in each pack. I would have preferred more rifles and fewer Thompsons but whatever. At least you can get them.
Anyway, the Eureka range is a great one and worth the money. I also use Axis and Allies Miniatures for vehicles. Command Decision is a great line too and you can modify the heavy weapons crews to man your 75mm SPMs and M3 Scouts.
Good luck with you project! I've been doing it for a while myself and have been very happy with it.
has a tip to help with your paint storage (and recognition).