Bovington's Tank Museum in Dorset has been handed a windfall two point five million pounds.
The money from the Heritage Lottery Fund will go towards a new tank restoration centre, two new exhibitions and more support for volunteers.
Tank Museum Director Richard Smith said; "This is a pivotal moment in the history of The Tank Museum.
The support of the Heritage Lottery Fund will ensure that we can continue to thrive, so we are naturally delighted and extremely grateful."
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Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.