What should a squad do if it comes under ambush?

In the context of a squad coming under ambush, returning fire and seeking cover is the most appropriate immediate response. This action allows the squad to effectively engage the threat while also protecting its members from incoming fire. When under ambush, maintaining situational awareness is crucial, and quickly reacting with return fire can help to suppress the enemy's ability to inflict damage.

By seeking cover, the squad can enhance their survivability and prepare for further actions, such as coordinating a counter-attack or planning an organized withdrawal if the situation dictates. This approach enables them to regain control of the situation and minimizes casualties.

Furthermore, while options like calling for air support or establishing a perimeter defense may seem strategic, they require a level of stability and control that can be compromised during an active ambush. Withdrawing from the area could also leave the squad vulnerable without a proper assessment of the situation and could increase risk by attempting to navigate through hostile territory without an effective response. Thus, focusing on return fire and seeking cover provides an immediate and actionable means of managing the ambush effectively.