Lock ’n Load Tactical’s System Demo Version 4.1 (v4.1) Modern Era edition. This demo uses the latest set of guidelines and regulations for the game system written by Jeff Lewis, Lead Developer of the Lock ’n Load Tactical Series. The demo comes with a basic printed rule book, printed map with extra large hexes, one scenario and seventy 1” counters to help you get into one of the easiest tactical systems available. Everything you need to try out LnLT is here. The Modern Era Edition takes you to Vietnam in 1969, where you can play either the US Army or the Viet Cong forces.