When defeating the Exosuits in the last stage, do not try to hide or run away from them for long time or else the missiles they send will hit you. Try to go over the dam-like object and target the first Exosuit in a soft corner, such as the eyes. Then quickly run and hide behind the mountain that is next to the entrance to the airfield near the Exosuit, The Exosuit will fire at you. Hide for about two seconds and quickly go towards the Exosuit. Hit it with the military super weapon that you found in the huge aircraft on the field. Four or five shots will be needed to nail down the Exosuit. Repeat the process for the second Exosuit.