Can I use an orca in the US?

Excuse me, but I'm curious to know if it's actually feasible to own and utilize an orca, or killer whale, within the United States? Are there any legal restrictions or permits required for such an exotic pet? Additionally, considering the immense size, complex needs, and potential danger posed by orcas, is it ethical or practical to keep them in captivity for personal use? I'm genuinely interested in understanding the logistics and implications of such an endeavor.