Swords are legal to import to the US. Most swords on the market are made in other countries. As far as brining swords home yourself, the only rule I know of is the import tax. IIRC, you owe no taxes if the amount your are importing is less than $400.00, but since swords are much cheaper in the Philippines than here, you'd still save money even with the tax. Two years ago I went to the Philippines and brought back an antique barong, a bolo, and some decorative kris. The customs agent asked what I had and I told him that I had swords and he said ok. His real concern was whether I had fruits because of possible contamination. In case you do have to pay taxes, make sure you get recipts on everything.