After I posted this question, a response was posted on Reddit identifying the game as Princess Ryan's Space Marines: Squad Combat in the 23rd Century, a miniatures game from 1986.

Avalon Hill published a sequel called Princess Ryan's Star Marines in 1997.

BoardGameGeek has more information about both the original game and the sequel.

After I posted this question, a response was posted on Reddit identifying the subject of the quoted post as not a game league, but instead a miniatures game from 1986 called Princess Ryan's Space Marines: Squad Combat in the 23rd Century.

Avalon Hill published a sequel called Princess Ryan's Star Marines in 1997.

BoardGameGeek has more information about both the original game and the sequel.

After I posted this question, a response was posted on Reddit identifying the game as Princess Ryan's Space Marines: Squad Combat in the 23rd Century, a miniatures game from 1986. More information about the game is available on BoardGameGeek.

After I posted this question, a response was posted on Reddit identifying the game as Princess Ryan's Space Marines: Squad Combat in the 23rd Century, a miniatures game from 1986.

Avalon Hill published a sequel called Princess Ryan's Star Marines in 1997.

BoardGameGeek has more information about both the original game and the sequel.