When did ASL develop?
Advanced Squad Leader
Aside from regular features in The General Magazine, AH also produced a series of magazines focused on ASL but with some original SL content also, beginning in 1989. The ASL Annual was, as the name implies, released once a year, with issues in 1989, 1990, 1991 and 1992, and two issues were published in 1993 (called ASL Annual '93a and ASL Annual '93b). No issue was published in 1994, with issues again appearing in 1995, 1996 and 1997. The 1995 issue was named ASL Annual '95w (Winter) in anticipation of a second issue that year being printed in the summer, but it did not materialize. Scenarios located in the ASL Annual were numbered sequentially with an "A" prefix, either ASL Scenario A1, A2, etc., or SL Scenario A1, A2, etc., Deluxe ASL Scenario A1, A2, etc.
American Soccer League (1921–33)
The American Soccer League has been a name used by four different professional soccer sports leagues in the United States. The first American Soccer League was established in 1921 by the merger of teams from the National Association Football League and the Southern New England Soccer League. For several years The ASL's popularity rivaled the popularity of the National Football League. Disputes with the United States Football Association and FIFA, and the onset of the Great Depression in 1929 led to the league's collapse in spring 1933.