@BurningRose, to help with your anxiety...
Just off the top of my head, here are some things the army has been called in to do.
– Help build the Nightingale hospitals. (2020)
– Help flood-hit communities in Calderdale, W Yorkshire. (2020)
– Help prevent the Whaley Bridge dam from collapsing, saving the
village. RAF involved too. (2019)
– Help build flood defences in Berkshire. Princes William & Harry turned out to help the troops as they were local. (2014)
– Provide security at the Olympics when G4S cocked up the contract. (2012)
– Help clear major snow from Edinburgh. (2010)
That's just straight off the top of my head.
Basically, if it's a huge job that needs massive, reliable manpower to do all of a sudden, then it's perfectly normal for the military to get asked.
Please don't worry just because the army is mentioned.