Full Metal Panic! Volume 11 by Shouji Gatou

The secrets of the Whispered have been revealed, but that knowledge has only brought new danger. Leonard has retreated to Merida Island, where he seeks to rewrite reality itself with Kaname by his side. And with Mithril's forces already aching and depleted, Amalgam has occupied a Soviet missile base—with the intent to trigger worldwide nuclear war! It's a two-fronted battle on Merida Island and the mountains of Afghanistan for the penultimate volume of Full Metal Panic!