Lawmakers have condemned the troop cuts as a gift to Russia fuelled by Trump's spite at Germany.
Defence Secretary Mark Esper defended the plan, saying that while the decision was "accelerated" by Trump's orders, the moves also promote larger strategic goals to deter Russia, reassure European allies and shift forces farther east into the Black Sea and Baltic regions.
"We're moving forces out of central Europe, Germany, where they've been since the Cold War," Esper said, adding that it will shift US forces east, closer to Russia, "where our newest allies are."
Trump, however, reasserted his very narrow reason today, telling reporters, "We're reducing the force because they're not paying their bills. It's very simple. They're delinquent." He added that he might rethink the decision to pull troops out of Germany "if they start paying their bills."
Trump has repeatedly accused Germany of failing to pay bills, which is a misstatement of the issue. Nato nations have pledged to dedicate 2 per cent of their gross domestic product to defence spending by 2024, and Germany is still short of that goal, at about 1.4 per cent.
Esper said the military moves will cost in the "single digit" billions of dollars, though bringing troops home could reap some future deployment savings. Some smaller units could move within months, and the plan leaves about 24,000 troops in Germany.
Twenty-two Republicans on the House Armed Services Committee sent a letter to Trump saying a reduced US commitment to Europe's defence would encourage Russian aggression. And Senator Mitt Romney, R, today called the plan a "grave error," saying it's a slap in Germany's face that will do lasting harm to American interests.
Nato Secretary-General Jens Stoltenberg welcomed the US move and said Washington has been consulting allies on the matter recently. Trump's announcement on the withdrawal in June blindsided the alliance.
Germany's Defence and Foreign Ministries, in a joint statement, noted the announcement, and said that "planning is not yet complete and may be subject to further adjustments."
Chancellor Angela Merkel has defended Germany's defence spending, saying that it has increased and that the country will continue to work toward the 2 per cent benchmark.
Under the plan, the Air Force's 52nd Civil Engineering Squadron could be the first to move, going from Germany to Italy, said General Tod Wolters, head of US European Command. An Air Force F-16 squadron and several other small units are also slated to go to Italy.
Following the announcement, a lawmaker with Germany's opposition Left Party, which has its roots in the former East German communist party and has urged a US troops withdrawal, called the plan "far from sufficient."
"Wars are waged all over the world through the US bases in Germany, including drone attacks that violate international law," said Tobias Pflueger, deputy party leader with the Left.
The Pentagon announcement is closely tied to the plan to increase the US troop presence in Poland, a shift long desired by Warsaw and Polish President Andrzej Duda.
Officials said the troop moves will require construction at bases in the US, specifically to accommodate the Army's 2nd Cavalry Regiment, which will move from Vilseck, Germany, to a yet-undetermined location in America.
Germany is a hub for US operations in the Middle East and Africa. The decision to keep nearly half the forces in Europe is a clear move by the Pentagon to assuage allies by avoiding the complete withdrawal of 12,000 troops out of the region.
And spreading forces into the east signals to Russia that the US is not reducing its commitment to the region and remains ready to protect Eastern Europe from Moscow's aggression.
Senator Jim Inhofe, the Republican chair of the Senate Armed Services Committee, has voiced support for the plan while acknowledging it will take "months to plan and years to execute."
Trump announced last month that he wanted to cut the number of active-duty US troops in Germany from roughly 36,000 to fewer than 25,000. Shifting forces out of the country had long been rumoured and is in line with Pentagon efforts to put more troops in the Indo-Pacific.
But Trump has tied the move to his anger over the Nato spending issue, branding Germany "delinquent" for failing to meet the Nato goal and asserting that the Germans have long shortchanged the US on trade and defence.
At a Rose Garden event last month with Duda, Trump said some of the troops from Germany would go to Poland. Today, officials suggested that Poland may get some additional rotational forces that would go in and out of Europe. Lithuania has also pressed for a US troop presence, but was not mentioned.
Under an agreement announced last year, the US said it was sending about 1000 more troops to Poland, and progress is being made to prepare for those moves.
Overall, the US has about 47,000 troops and civilian personnel in Germany. Most of the 36,000 on active duty are in a handful of larger Army and Air Force bases including Ramstein Air Base, a regional hub. There also are 2600 National Guard and Reserve forces and almost 12,000 civilians there.
- AP