1.)

Grip the mask firmly. Don't be nervous as you begin the process, especially if you are in a situation where your commanding officers are about to send gas your way. Controlled environment or not, the gas will be real, and will have a real effect on your body

2.)

Lift your head. You're going to put the mask on chin first, so lift your head and be sure that the straps, fastened or not at this point, are clear so that you can put your face into the mask.

3.)

Place your chin into the mask first. If there is an indentation or cup-like area for your chin, place it securely there, making sure to have a snug fit. Push the mask to your face, from the chin upwards.

4.)

 Push the mask tightly to your forehead, making sure that the sides of the mask are secure and snug against your face. Breathe in to measure the strength of the seal against the contours of your face.


5.)

Put straps around your head as required, and tighten them. Again, test the seal by breathing in, and make sure there is no air entering from the sides of the mask. You want to get a complete seal around all edges of your face in order to use the gas mask properly