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The dramatic reversal was the culmination of intense international pressure and diplomatic arm-twisting that played out over the last week. And it resulted in in a quick succession of announcements: The U.S. said it will send 31 of the 70-ton Abrams battle tanks to Ukraine, and Germany announced it will send 14 Leopard 2 tanks and allow other countries to do the same.
A look at the massive battle weapon, why it is important to Ukraine's war with Russia, and what drove the Biden administration's tank turnabout.
WHAT ARE THE ABRAMS?
M1 Abrams tanks have led American battle assaults for decades.
Carrying a crew of four, the Abrams was first deployed to war in 1991. It has thick armor, a 120 mm main gun, armor piercing capabilities, advanced targeting systems, thick tracked wheels and a 1,500-horsepower turbine engine with a top speed of about 42 miles per hour (68 kilometers per hour).
Crews interviewed in a 1992 Government Accountability Office review after the Persian Gulf War praised its high survivability and said “several M1A1 crews reported receiving direct frontal hits from Iraqi T-72s with minimal damage.”
More recently, the battle titans led the charge to Baghdad during America’s 2003 invasion of Iraq, as 3rd Infantry Division units conducted what was dubbed “Thunder Runs” to break through Iraqi defenses.
The Abrams' powerful jet engine can propel the tank through almost any terrain, whether heavy snow or heavy mud, said Kevin Butler, a former Army lieutenant who served as an Abrams tank platoon leader. Butler recalled a muddy exercise in the late 1990s at Fort Stewart, Georgia, where he’d voiced concern about the tanks getting stuck because it had already stuck the Humvees.
The Abrams, he said, "didn’t even notice” the mud.
WHY THE U.S. KEPT SAYING NO
The Abrams' jet engine needs hundreds of gallons of fuel to operate.
It will burn through fuel at a rate of at least two gallons per mile (4.7 liters per kilometer), whether the tank is moving or idling, Butler said, which means a constant supply convoy of fuel trucks must stay within reach so it can keep moving forward.
The U.S. worried that the fuel demands would create a logistical nightmare for Ukrainian forces. While an Abrams can storm through the snow and mud, fuel trucks can't. In addition, like any jet engine, the Abrams' turbine needs air to breathe, which it sucks in through filtered rear vents. When those vent filters get clogged — whether by sand, as soldiers reported to GAO in 1992, or by debris they might encounter in Ukraine — they can't perform.
“The Abrams tank is a very complicated piece of equipment. It’s expensive, it’s hard to train on. ... It is not the easiest system to maintain. It may or may not be the right system,” The under secretary of defense for policy, Colin Kahl, told reporters last week at the Pentagon.
The Abrams also will require months of training. Ukrainian forces will have to learn how to operate its more complex systems, and how to keep it running and fueled.
THE ARM-TWISTING TURNABOUT
Despite all the drawbacks expressed by the U.S., when all was said and done, it came down to political realities and a diplomatic dance.
Germany had been reluctant to send the Leopards, or allow allies to send them, unless the U.S. put its Abrams on the table, due to concerns that supplying the tanks would incur Russia’s wrath. The U.S., meanwhile, argued that the German-made Leopards were a better fit because Ukrainian troops could get them and get trained on them far more quickly and easily.
The impasse frustrated European allies, such as Poland, who wanted to send Leopards but couldn’t without Germany’s OK. Thus began the more fierce negotiations.
U.S. and German officials both used the word “intensive” to describe the talks that ultimately led to the tank turnabout by both countries.
“This is the result of intensive consultations, once again, with our allies and international partners,” Chancellor Olaf Scholz said in an address to German lawmakers on Wednesday.
Echoing Scholz, a senior U.S. administration official said talks had been going on for some time but “in a much more intensified way over the last number of weeks.” The official spoke on condition of anonymity to provide details on the decision.
From President Joe Biden on down, calls were made, including to Scholz. Defense Secretary Lloyd Austin and Army Gen. Mark Milley, chairman of the Joint Chiefs of Staff, spoke and met with their German counterparts and other allies.
Gradually, the German stance began to publicly soften, leading to Wednesday's announcements. Asked repeatedly what changed, Biden administration officials sidestepped. Asked directly about German pressure, Biden told reporters, “Germany didn’t force me to change our mind.”
HOW LONG WILL IT TAKE
Timing for both delivery of the tanks to Ukraine and the training of Ukrainian troops is fuzzy. U.S. officials would only say that it will take “many months” to deliver the Abrams tanks, but that the Leopards will arrive faster.
Doug Bush, assistant secretary of the Army for acquisition, said the U.S. no longer buys new Abrams, but uses older ones as “seed vehicles” and refurbishes them. Doing that, however, isn't quick or easy, he said.
The training can begin more quickly, and the Pentagon is developing a program.
“We want to make sure that they (the tanks) fall on ready hands, and that the Ukrainians know how to use them, they know how to keep them running, and they’ve got the supply chain in place for spare parts and supplies," said National Security Council spokesman John Kirby.
Bush said the Ukrainians have shown they have the knowledge and capabilities to learn new systems quickly.
“We can often abbreviate and accelerate what we can do in terms of training for Ukrainian army soldiers,” he told reporters Wednesday. "With enough motivation and dedicated 24/7 access to them, we can train people really quickly,” he said. "The U.S. Army knows how to do that.”
Associated Press writer Aamer Madhani contributed to this report.