What challenges did the soldiers storming
the beaches of Normandy face?

On day the allies landed around 156,000 troops and normally the American forces landed numbered 73,000 23,250 on Utah beach 34,250 on Ohama beach and 15,500  on airborne troops

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.