If you demand a number for a wargaming table: in direct defensive action, 50–500 in asymmetric strike roles, and infinite for certain strategic missions.
They would answer in the way soldiers always do: not with a spreadsheet, but with a story. 1 commando is equal to how many soldiers
A 4-man team sabotaging a fuel depot can paralyze an entire armored battalion. If you demand a number for a wargaming