OCS nasty trick for players: move a Reserve unit 25% of its MA. Seem unfair? It's not....read the yellow box in the image below. Before putting a unit in reserve mode you can choose travel or combat mode before placing the reserve status marker.
If it's in travel mode suddenly 25% is quite a bit. Suddenly that mechanized unit in travel mode can take a 3 hex move even though it's in reserve.
Another subtle yet brilliant feature of the game as this represents combat reserves being shuffled behind the lines.