United States Nuclear Forces and Military Power Profile

The United States maintains the world's most powerful military and the second-largest nuclear arsenal. As the only nation to have used nuclear weapons in conflict (Hiroshima and Nagasaki, 1945), the US nuclear posture is a cornerstone of both its national defense strategy and the global deterrence framework. US nuclear weapons policy and military deployments are primary drivers of the current Doomsday Clock risk assessment.

Nuclear Arsenal

The US nuclear stockpile is distributed across a full nuclear triad — land-based ICBMs, submarine-launched ballistic missiles, and strategic bombers — all undergoing a multi-decade modernization program estimated at $1.7 trillion.

Delivery Systems

Land-based ICBMs: The US operates 400 Minuteman III ICBMs housed in silos across Montana, Wyoming, North Dakota, Colorado, and Nebraska. The LGM-35A Sentinel is the planned replacement, though the program has faced cost overruns.

Submarine-launched ballistic missiles (SLBMs): 14 Ohio-class ballistic missile submarines (SSBNs) carry Trident II D5 SLBMs. Each submarine carries up to 20 missiles with multiple independently targetable reentry vehicles (MIRVs). The Columbia-class SSBN is the planned replacement.

Strategic bombers: The US Air Force operates B-52H Stratofortress and B-2A Spirit stealth bombers. The B-21 Raider is entering service as the next-generation stealth bomber. These aircraft can deliver both nuclear gravity bombs (B61-12) and air-launched cruise missiles (AGM-86B ALCM).

Non-strategic nuclear weapons: The US maintains approximately 200 B61 tactical nuclear gravity bombs, including ~100 forward-deployed in Europe under NATO nuclear sharing arrangements.

Military Overview

The United States holds the top Global Firepower ranking with the world's largest military budget, the most advanced air force, 11 nuclear-powered aircraft carriers, and global power projection capabilities unmatched by any other nation.

Role in Current Nuclear Risk

The US is at the center of the current nuclear risk escalation:

• Iran crisis: Operation Epic Fury and ongoing US military strikes against Iranian targets have placed the US in direct conflict with a nuclear-threshold state. The buildup of US forces in the Middle East is the most significant since the 2003 Iraq War.
• Extended deterrence: US nuclear umbrella commitments to NATO, Japan, South Korea, and other allies create potential flashpoints across multiple theaters.
• Nuclear modernization: The $1.7 trillion modernization of the nuclear triad is the largest since the Cold War, with critics arguing it lowers the threshold for use.
• Arms control: The expiration of New START with Russia and lack of progress on new arms control treaties with China have reduced nuclear risk guardrails.

Operation Epic Fury: The US Campaign Against Iran

The United States launched Operation Epic Fury on February 28, 2026 — the most significant American military campaign since the 2003 Iraq invasion and the first US military strikes against a near-nuclear state's enrichment infrastructure.

Force deployment: The Pentagon has deployed approximately 50,000 military personnel to the Persian Gulf region, including two carrier strike groups, 120+ combat aircraft, THAAD and Patriot missile defense batteries, and ground forces across six host nations. B-2 Spirit stealth bombers flying from Diego Garcia delivered GBU-57 Massive Ordnance Penetrators against Fordow's underground enrichment halls — the first combat use of the weapon's full penetration capability.

Congressional war powers debate: The administration launched strikes without seeking an Authorization for Use of Military Force, citing Article II commander-in-chief powers and the 2001 AUMF. Multiple lawmakers from both parties have challenged this legal basis. Senator Tim Kaine introduced a War Powers Resolution to force a withdrawal vote within 60 days. The constitutional confrontation over war powers is the most significant since the 2011 Libya intervention.

Economic consequences: The conflict has produced immediate domestic impact. The Strait of Hormuz blockade pushed gasoline prices above $5/gallon nationally, with 11 states declaring fuel emergencies by Day 3. The administration announced a coordinated Strategic Petroleum Reserve release, but analysts note that SPR drawdowns cannot compensate for the sustained loss of 20% of global oil supply. The economic dimension creates a political clock running parallel to the military one — every day of elevated prices increases domestic pressure either to escalate (break the blockade by force) or de-escalate (negotiate a reopening).

Alliance management: Gulf states hosting US forces — Qatar, Bahrain, UAE, Kuwait — have carefully avoided characterizing their role as participation in offensive operations, aware that Iran's retaliatory strikes targeted US installations on their soil. The bilateral nature of the operation (only Israel as a partner) limits the coalition support structure that sustained the 2003 Iraq campaign for nearly a decade.

Nuclear precedent: Operation Epic Fury established the first precedent since Israel's 1981 Osirak strike for the use of military force to prevent nuclear proliferation. Whether this precedent deters future proliferators or accelerates them — by demonstrating that only a completed weapon prevents attack — is the central strategic question facing US policymakers.