Anduril, a defense tech startup, raised $2.5 billion at a $30.5 billion valuation led by Founders Fund.Founders Fund invested $1 billion in this new round, which is the largest check the firm has ever written.Anduril's Series G raise saw over 8x oversubscription, indicating high investor demand for the company.The funding was raised after Anduril doubled its revenue to $1 billion and secured the U.S. Army contract for new AR/VR headsets for soldiers.