It was not until June 6, 1944, four years later, that the allies landed on the Normandy coast. Over 200,000 troops, in a 48-hour period, in the largest amphibious operation in history, stormed the beaches to do what the Germans thought impossible. Eight months later, Germany was defeated.

The cost was high, however. With the German Army facing little opposition in the Rhineland, Austria, or Czechoslovakia, the German invasion West into the low countries and France was easy. Western Europe fell in a matter of three months from April to June 1940. At the end of the day, once deterrence was lost, World War II led to the death of over 60 million people. Getting deterrence back was a tough proposition.

In 1949, the United States withdrew its military from the Republic of Korea. Then, in January 1950, the US Secretary of State, Dean Acheson, asserted that the Republic of Korea (ROK) was beyond the US defense perimeter. In early June, the US Congress approved an aid package for the ROK, but it was not delivered until after the North Korean invasion that began on June 25, 1950. Undermining American deterrence of North Korea with Acheson’s speech ultimately cost 2 million Korean lives and nearly 200,000 allied casualties.

Although the US was able to reestablish deterrence in Korea seven decades later, in 2014, the United States lost effective deterrence once again—this time in Europe. That was the year Washington declared that Ukraine was not of interest to the United States, leaving Ukraine to the tender mercies of the Russian Army. Russia soon took Crimea and ultimately launched a brutal invasion in 2022.

In 2021, the US withdrew ignobly from Afghanistan, further signaling the nation’s enemies that the US was not in the deterrence business. The consequences of that act are still unknown.

Later in 2021, the administration hesitated in making it clear whether Washington would or would not defend Ukraine from further Russian aggression. Though the mistake was later rectified, the damage to deterrence was done.

Further harm came to Ukraine, the US, and the North Atlantic Treaty Organization’s (NATO) European member states when it became clear Washington was fearful of a Russian escalation of the conflict should the allies get serious about pushing back against Russian aggression. Russian President Vladimir Putin repeatedly threatened the use of nuclear weapons should Ukraine and the allied coalition get serious about rolling back Russia’s aggression—the successful use of Russian deterrence.

To counter the American loss of deterrence, Congress agreed to markedly increase defense spending and investments in America’s nuclear deterrent, space capability, and missile defense. Over time, and coupled with a sense of urgency, the United States can restore deterrence if these new investments are sustained.

The nation’s legacy nuclear deterrent, which is now between 35 to 65 years old, will soon age to obsolescence. The Sentinel intercontinental ballistic missile (ICBM), Columbia-class ballistic missile submarine (SSBN), and the B21 Raider strategic bomber, along with the long-range nuclear cruise missile, once built, will markedly restore nuclear deterrence. An improved theater nuclear deterrent, with a new sea-launched nuclear cruise missile and a stand-off nuclear capability for the F-35, would also significantly improve deterrence.

These systems give the nation the capability required to deter China and Russia. However, the second part of deterrence is will. Whether the United States has the will to employ its deterrent capability is uncertain.

How the administration handles Iran will say a great deal about how adversaries see American will. The administration is committed to preventing Iran from getting a nuclear weapon. Washington said you could do this the easy way or the hard way. A negotiated deal is one way but military strikes on Iran’s nuclear infrastructure is the other.

With the Israelis and Americans on the same page and the war already begun, the die is now cast and the US does not have endless patience. But whether it is willing to use military force is uncertain. Although Henry Kissinger once said that diplomacy without the threat of force is without effect, the conventional wisdom in Washington is that no military action will be forthcoming.

The Trump administration carefully laid out a challenge to the Iranians. There were 60 days for negotiations. Now, it is widely known that on day 61 the Israelis, with US missile and air defense assistance, took out most of the above ground Iranian nuclear capability as well as the top Iranian nuclear leadership.

Perhaps Israeli deterrence credibility was restored, but whether that is true of the United States is far less certain. The Trump administration did what it said it would do. The Israelis did what they had to do. Both nations did what was necessary to restore deterrence. The Iranian nuclear capability is gone. How this will affect Chinese and Russian aggression, that requires more insight.

Peter Huessy is a Senior Fellow at the National Institute for Deterrence Studies.

Restoring Deterrence was originally published on Global Security Review.

The use of atomic weapons on Japan by the United States was the culmination of the Manhattan Project’s extraordinary technological achievements. The decision to use these weapons came after US Army and Navy estimates of a protracted invasion of the Japanese home islands (Kyushu, Shikoku, Honshu, and Hokkaidō) offered casualty ranges from the tens to hundreds of thousands. If the Japanese fought as hard on their own home territory as they fought for Okinawa, for example, there was real concern that the loss of American life would eclipse that seen in Europe.

Additionally, the estimated losses on the Japanese side were five to ten times that of the United States. Japanese tenacity and refusal to surrender in the face of certain defeat was both hated and admired by American troops.

At the time of Germany’s defeat on May 7, 1945, the United States was five weeks into one of the bloodiest fights of the entire war, the battle for Okinawa, which cost more than 50,000 American casualties before the island was taken in late June. Only after the war did it come to light that more than 110,000 Japanese soldiers and 150,000 Okinawan civilians died in the battle. About half of Okinawa’s pre-war population was killed during the battle, sometimes at the hands of Japanese soldiers.

For the military commanders of the war in the Pacific, Okinawa demonstrated a stark example of the Japanese resolve and willingness to fight and die. It should come as no surprise that President Harry Truman, a World War I veteran, understood the difficult decision required to take provocative actions to save American lives. While this was not a war the Americans started; it was a war we had to win—without conditions.

Scholars and non-scholars alike may continue to debate the moral, ethical, and legal justifications of the use of the atomic bomb, but there is little doubt that the men assigned to military units waiting for the invasion to begin were happy to know that the atomic bomb made the loss of their own lives unnecessary. Their families were certainly happy as well. In the articles that often appear on the anniversary of Hiroshima, there is often a lack of understanding of the American lives (and Japanese) that were saved by the use of the atomic bomb.

The Manhattan Project began because the United States feared Nazi Germany would successfully develop the bomb first. With Germany falling to the allies in May 1945, just months before the bomb was ready, it was a logical transition for the target of the A-bomb to shift from Europe to Japan. The weapon, originally designed to counter a German threat, became the best option to quickly end the war in the Pacific.

Often, the articles commemorating the use of an atomic bomb on Hiroshima repeat inaccuracies and leave out important facts. For example, it is common to suggest that the detonation of Little Boy directly caused all of the devastation experienced in Hiroshima. However, approximately 80 percent of the death and devastation in Hiroshima was caused by the fire that began with the detonation and spread far beyond the area directly affected by the bomb. This same level of damage would have been realized with one of Curtis LeMay’s conventional fire-bombing raids because Japanese buildings were in close proximity to one another and made of highly flammable wood and paper. The blast effects of the bomb, while dramatic, were not the leading cause of destruction and loss of life—as is normal with a nuclear detonation.

In retrospect, the American firebombing of Tokyo was far more destructive of life and property than either atomic bomb. Little Boy was detonated at such a high altitude, about 1,400 feet above ground zero, that its damage was limited.

The decision to drop the atomic bomb on Hiroshima was a sound military decision that took the best military advice, applied casualty estimates for a future fight to the equation, and reached a sound decision. The atomic bomb did exactly what President Truman and General Marshall desired—end the war as quickly as possible with the least loss of American (and Japanese) life.

The loss of an estimated 150,000 Japanese lives in Hiroshima and Nagasaki was tragic, but more than justified by the American lives saved. This number, however, in comparison to the estimates of over a million Japanese and American lives that were projected to be lost in an invasion drives a different conclusion and deeper reflection than numbers alone.

The benefit of hindsight to those who challenge the use of the atomic bomb on Hiroshima often forget that there were real American soldiers, sailors, airmen, and marines (as well as Japanese military and civilians) who would have died by the hundreds of thousands had the war continued. War is a terrible thing, and, paradoxically, the dramatic use of the atomic bomb, while taken as a single event appears horrific, in contrast to the larger landscape of lives saved demonstrates a justified use that saved lives in the end. Because of this, American warfighters returned home to start lives, get married, raise children, and pursue lives that may very well have ended with a bullet or bomb in Japan.

USAF Col (Ret) Paul Hendrickson, PhD, is a Fellow at the National Institute for Deterrence Studies. The views expressed are his own.

Reflections on Hiroshima: August 6, 1945 was originally published on Global Security Review.