There are various commands that grant special rules or bonuses to units given specific movement orders and generally these are phrased reasonably well.
Some examples:
Bourne by Angels - The unit gains the Fly special rule while executing an Advance! or At the Double! movement order.
Brace for Impact - Unless the unit moves At the Double! or Charges this Turn, until the start of its next Turn, the unit increases its De by one (e.g. 4+ becomes 5+) while being targeting by any attacks in its front facing.
Marching Orders - When this unit is issued an At the Double! order, it can make one additional pivot during the move.
Tactical Retreat - If the unit performs a Back! order, it may move up to its Sp value, but may not make any pivots. This order may not be issued to a unit carrying a Loot Counter.
Nimble Feet - The unit cannot be issued a Charge! order this Turn, but gains +n Sp, where n is the number of successful dice rolled to issue this order.
Bear Traps - The target unit must have received or be given a Halt! order this Turn and cannot already be Engaged. Until its next Turn, enemy units charging this unit each suffer D6 damage after making contact and moved to their final position. Damage taken this way does not trigger a Nerve test.
The last is the only one which forces you to give a specific Movement order to a unit after you have given them the command; while the penultimate one prevents that unit being given a certain command.
With the others, there’s no limit on what orders are given, but they only gain the benefit with certain ones.
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There is one slightly odd command which doesn’t limit who it can be given to, but would be helpful if it was clarified whether it can only be given to units with Shambling.
Dance of Death - The unit loses the Shambling rule for this Turn. Infantry units also gain the Pathfinder rule this Turn.