Ah, but the Panama intervention was all about American economic interests, and the Grenada one was about saving American lives. What economic or other interests does the USA currently have in Myanmar?
Limiting Chinese influence could be a goal by itself. Of course, boots on the ground would mean risking a Chinese intervention as well, like it happened during the Korean War. Different to that one and Vietnam though is, in Myanmar there is no comparable status quo ante belli. It is not at all clear whether the West has any support or some sort of stake in Myanmar. It would be like Irak all over again.
That would be exactly like Vietnam though (and like Korea too), the USA has no other reason to be there other than that they were trying to limit the Russian sphere of influence.