[2] Skill and combat rules are fairly simple, as they are descended from the original Traveller systems.
[2] The "Event Tables" book (48 pages) is full of randomized tables for covering almost any kind of situation: encounters in woods, towns, and fortifications; on railroads; for parachuting and mountain climbing; etc.
[2] The "Missions" book (56 pages) has three scenarios, four miniscenarios, and numerous "pregenerated" NPCs.
[2] Behind Enemy Lines was designed by William H. Keith, Jr., with Jordan Weisman, Ross Babcock, Eric Turn, and Steve Turn, with artwork by James Clouse, William H. Keith Jr., and Jerry O'Malley.
Swan found the 8-year-old game had been superseded by superior products such as Phoenix Command and Merc, and concluded by giving the game a poor rating of only 1.5 out of 4, saying, "Neither good history nor interesing fantasy, Behind Enemy Lines is best forgotten.