Which of the following is the first step in the POPS procedure?

The first step in the POPS procedure is to pull the charging handle. This action is crucial because it ensures that the weapon's action is engaged and that a round is properly chambered. By pulling the charging handle, the operator can either load a round into the chamber from the magazine or clear a malfunction by ejecting any unchambered round. This step is foundational for safe handling and operation of the weapon, as it prepares the firearm for subsequent actions, such as observing the round or firing.

The other options pertain to different aspects of weapon operation but do not serve as the first action in the POPS procedure. Observing the round comes after ensuring the weapon is in a ready state, and pushing the charging handle or squeezing the trigger relates to either disengaging the bolt or firing the weapon, respectively. Therefore, initiating the procedure with a proper pull of the charging handle establishes a critical starting point for safe and effective weapon handling.