Final answer:
The three variations of the retrograde in military tactics are delay, withdrawal, and retirement, each serving distinct strategic purposes.
Step-by-step explanation:
Delay, withdrawal, and retirement are the three variations of the retrograde. Retrograde is a military term that refers to a strategic movement of troops away from the enemy.
Although retrograde might seem counterintuitive in a combat scenario, it can be a powerful tactic used to reorganize, conserve forces, or draw the enemy into a less advantageous position. Delay is used to slow down the enemy's advance, withdrawal is a more organized retreat to avoid engagement, and retirement involves moving forces back to a secure position when contact with the enemy is not imminent or to better defensive terrain.