Brigadier Martyn Gamble, commander of 160 Wales Brigade, told ITV News that Armed Forces Day was a chance for those serving to say thank you to members of the public for their support.
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From Monday. two households can meet outdoors if they remain within five miles of their home.
There have been 86 confirmed new cases of the virus in the country.
The FSB said firms will consider this as the "starting gun on reopening Wales."