"Be sure you positively identify your target before you pull the trigger"

In this quote, Tom Flynn is highlighting the value of being definitely particular of your target before taking any action. The phrase "shoot" is typically connected with making a decision or acting, and in this context, it indicates to act upon something. By stating "make certain you favorably identify your target," Flynn is urging care and careful factor to consider before making a relocation. This might use to any scenario where a decision or action needs to be taken, whether it be in a literal sense of using a weapon or in a metaphorical sense of making a decision. In general, the message is to always be sure of your target before taking any action.