A bill to improve the missile defense capabilities of the United States, and for other purposes.

Integrated Missile Defense Act of 2018 This bill addresses U.S. missile defense capabilities in response to nuclear threats from North Korea under the regime of Kim Jong-un. It urges or directs the Missile Defense Agency to accelerate the fielding of 20 additional ground-based interceptors with Redesigned Kill Vehicles (RKVs) at Missile Field 4 at Fort Greely, Alaska, and mate the RKVs with the newest booster technology; ensure the development and deployment of persistent space-based sensor architecture; plan a fully interoperable and integrated air and missile defense architecture; accelerate its hypersonic missile defense program and deploy such program in conjunction with a persistent space-based missile defense sensor program; seek to establish missile defense capabilities with allies and trusted partners of the United States; and pursue an increasingly rigorous testing regime and prioritize discrimination capabilities to improve missile defense effectiveness against current and future threats from countries hostile to the United States. .