By Megan Humphrey Arsenal Women will be heading to the United States for the first time this summer as part of their pre-season preparation. The team will be based in Washington DC from 15-26 August, with friendly matches taking place against National Women’s Soccer League side Washington Spirit and Women’s Super League champions Chelsea. The games will take place at Audi Field on 18-25 August, with a training camp at George Mason University. Arsenal sporting director Edu Gasper said: “We always want to create the best conditions for our teams to prepare and perform at their best in pre-season…