What is the first step when activating the MK-13 flare?

The first step when activating the MK-13 flare involves selecting the proper end. This is crucial because the flare has distinct ends designed for different functions. Ensuring that the correct end is selected prevents accidental activation or misuse, which is important for safety. Selecting the proper end also prepares the user for the next steps in the activation process, allowing for a smooth transition to removing the cap and fracturing the seal afterward. This step sets the stage for the safe and effective deployment of the flare, making it essential to begin with this precautionary measure.