An agreement has been reached between the UK and France to restart the flow of freight between the two countries.
The armed forces will be part of an operation to give rapid Covid tests to lorry drivers with a result in around 20 minutes.
It will take several days for the system to clear the backlog with around 3,000 lorries in Kent waiting to cross the English Channel.
France closed the border on Sunday due to growing concern about a new variant strain of coronavirus spreading across the UK.
Flights, ferry services and Eurostar trains will resume services under the agreement — but only for French nationals or residents and EU citizens who have tested negative for Covid.
Huw Edwards presents BBC News at Ten reporting by transport correspondent Caroline Davies and business editor Simon Jack.
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