This is a game forum, so let's keep it both simple and relevant. The answer can be found in tank names.
Cromwell - Great war leader, useless as Lord Protector, and loathed by his own comrades such as the Diggers and the Levellers.
Churchill - Great war leader, the worst occupant of No. 11 ever, and as a floor crosser loathed by many in both the Liberal, and Conservative parties.
We don't have a tank called the ....
Atlee - Christian cadet corps leader, coalition builder, defeater of Halifax's attempts to bring down Churchill in 1940, and as Lord Privy Seal and de facto Leader of the House of Commons he "ran" the country, leaving Churchill free to run the M.O.D. and boost the morale of the people.