I've found something that works.
Never heard of a "trainer" before posting this same question at a gaming forum and being pointed to megagames.com
There you can download a small exe file that you launch prior to launching Battlefront. Once you're in the game, you simply hit shift+___, the ___ being a number corresponding to a list of cheats, including infinite health, ammo, jet pack, mission time, and several others.
Be careful with the files at megagames. I downloaded the two trainers for Battlefront II, Pizzadox and Fraya. When I unzipped them, the Fraya trainer contained a trojan. The Pizzadox was clean and worked just fine and I've now finished Hoth.
Here's the direct link to the Battlefront II Pizzadox trainer: