The US has previously observed the Hague Convention protocols about not using expanding bullets designed to inflict undue suffering, etc., on a voluntarily basis because it didn't want to be seen as being inhumane. A lot of this stuff originated with the British use of "Dum Dum" bullets during the Boer War. The Hague Convention said nothing about carpet bombing, nukes, flamethrowers, napalm, land mines, etc., all of which cause, or can cause, much more suffering than bullets. It seems that use of expanding bullets in warfare by the USA is now considered perfectly OK, and it's certainly high time, especially as those enemies we are now exchanging fire with are not protected under the Hague Convention in any event.
Some years ago, I had information on very good authority that SEALs were using "special purpose" ammunition to good effect, and I'd guess they still may be. Hopefully, any of our troops who find themselves in situations where it is needed will also be able to use it now.