The twelfth mission in the Earth Alliance '71' story path and a reasonably easy one to clear though depending on your suit of choice S-ranking it can be a slight pain due to the time limit and needing to take out every enemy before they escape.
Your allies for the most part are fairly capable in this mission though you will want to take out the CGUE near the start as well as the DINN a little out the way before moving up, take out the GINN on the way for meter before taking out the DINN near the water before turning your attention to the building until the new enemies spawn in then switch targets to them as once the building goes down they will start to run away so leave the building to your allies as they should be able to finish the stationary object while you use meter to quickly clean up the enemy just be mindful the buildings don't stuff your attacks.