"Welcome to Poland," Prime Minister Beata Szydlo told US troops in Zagan, the Polish town on the German border where the brigade will be headquartered, adding "we hope you feel at home".
"The presence of American soldiers in Poland is another step in our strategy to ensure safety and security for Poland and the region," she added.
Hailing from Fort Carson, Colorado, the so-called "Iron Brigade" comprising some 3,500 soldiers and heavy equipment will also be deployed in NATO partners Estonia, Latvia, Lithuania, Romania, Bulgaria and Hungary on a rotational basis.
"This is America's most capable fighting force: a combat-ready, highly trained US armoured brigade, with our most advanced equipment and weaponry," US Ambassador to Poland Paul James said at the ceremonies, also attended by hundreds of Zagan residents.
"This force embodies America's iron-clad commitment to honour our NATO treaty obligation to defend our NATO allies."
The US troops and tanks began streaming into Poland Thursday as part of one of the largest deployments of US forces in Europe since the Cold War, an operation that Russia angrily branded a security "threat".
Poland yesterday told Trump that any improvement in Washington's ties with Moscow cannot come at the cost of harming Warsaw.
According to Poland's Defence Minister Antoni Macierewicz, a total of 7,000 US and NATO troops will be stationed in his country in the coming years.
The defence ministry held "Safe Poland" picnics today in cities across the country, allowing average Poles to meet with Polish and newly deployed US troops, view military hardware and chow down typical Polish army grub including pea soup with ham.
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