Well they could be from 2 places. One place is Africa, many old African tribes around the congo area made arrows with tips like that. The second place could be native Americans, most likly from the western United States. One good way to find out where they could be from is the feathers that are used as fletching. Also the metal that is used to make the tips could give you a ruff idea of where they were made.
After racking my brain the people that made the bow and arrows were the "Negrito".They would set up a stand on the Subic Naval Base and sell there goods,they were only about 4 1/2 to 5 feet tall.The marking on the tube that the arrows go into would be in reference to there tribe.
Can you post a photo of the nock end of the arrow? Also is the tube made of bamboo?
Most of there items were made to sell to the troops not made to use. Take a look at this PLATE 4.
I guess Native Americans could have started fashioning spear or arrowheads from metal, after garnering metal through trading, etc... but I'm not sure any tribes really adopted that style. I'd have my doubts, and would guess if any indian tribes did go the way of metal, it would be more to sell as trinkets, and not as weaponry ?
I think there are clues there to suggest Asian. Retiredusne8 is more than likely right on.