Red Ace High

From publisher blurb:

Red Ace High was originally presented as the introductory adventure in the 1984 TIMEMASTER RPG boxed set.

The Time Corps Sentinel - our watch-man in the Out-time - has reported a Demorean penetration of Parallel T-0. The penetration lies in November of 1917, at a critical point on the WWI Western Front. With basic training completed, you are ready for action in the field. In light of the talents and skills in your group, we know we have chosen the best tem to tackle this assignment.