Into the Unknown of a different world

This is all fictional and for fun,So no offense to anyone if something I write offends you. This is my very first story so... yea The U.S. decides to pull out of the UN no longer wanting to be controlled by them they decide to look for new ways to improve their military for any retaliation to come from them. Returning all their military from all around the world to mainland U.S. ,Hawaii and Alaska Suddenly in a turn of events happen and they find themselves in another world Confused but ready to fight with all its Military might against anything they come across. Help me with Suggestions to help improve the story in order to improve the quality and entertainment of it. Leave any suggestions or Questions you have about any of the stories I have written https://discord.gg/D9pymeK