New York City, Manhattan.
The battle of New York has basically ended. Soldiers and researchers have cleaned up weapons left by aliens, such as energy guns and various exoskeleton armor.
The technology level of Chita Swiss soldiers is at least one hundred years ahead of that of the earth. At least all Chita Swiss soldiers have exoskeleton armor and energy guns.
The human science and technology tree is basically gunpowder weapons, which has not yet risen to the level of energy weapons, but there are many black technologies in Marvel.
Far apart, take Tony Stark, the Iron Man, for example. His Mark series armor has particle guns and