In most military operations, the initial forces deployed to the battlefield are typically made up of frontline units, which include infantry, special operations forces, and support elements. These troops are trained and prepared to engage with the enemy as soon as conflict begins. Often, the decision on which units go in first is based on strategic objectives, the nature of the conflict, and the geographical location of the enemy.
Additionally, airpower is often utilized to gain the upper hand and secure the area before ground troops are sent in. Airstrikes can provide crucial support, softening targets and disrupting enemy movements. The level of intelligence, reconnaissance, and the urgency of the situation also influence which units are deployed first.
Ultimately, the military command structure makes decisions on deployment based on extensive planning and assessment, aiming to achieve the best possible outcome with minimal risk.