The Fate card Echoes of the Force reads, "You may commit a target unit to or remove a target unit from the Force." Could I use it to commit an enemy unit to the Force?

Yes, that would be one of it's main uses to force your opponent to double focus a unit.

Most of the time you will probably be using it on enemy units, either to double focus them or to remove them from the force so that you can win the force struggle (or Force Storm them). You may also use it to remove a commitment from your own unit on occasion. Much less common will be committing your own unit (prime targets being Mara and Nightsisters currently, or to protect someone from Force Storm).

I've had it in hand and it allows you to use your own units that you normally wouldn't commit to take the force (Luke/Han) as well.

Thanks all. I like the idea of using the card to force my opponent to put his force cards on units with only one or two Force icons so it's easy to win the Force struggle. I doubt that would work unless they already have two units committed, but it's fun thought.