(3) If the facepiece does not collapse or does not remain collapsed while
you hold your breath, remove any hair, clothing, or other matter between your face and
the mask. Then repeat the check for leaks.
h. Resume Breathing. Once the mask has been successfully checked for
leaks, resume normal breathing. The mask will protect you from any nerve agent in the
PUTTING ON YOUR PROTECTIVE HOOD
Be careful when putting on the hood because it could snag on the buckles of the
head harness and tear.
a. If you have the M17-series, M25-series, or M-43 series protective mask, pull
the hood over your head and zip the front closed to cover the exposed skin.
b. If you have the M24-series or M45-series protective mask, replace your
helmet on your head and pull the M7 hood over your helmet and head so that it covers
c. If you have the M40-series protective mask, don the hood so that it lies
smoothly on your head. For masks with a regular hood:
Grasp the back edge of the hood skirt.
(2) Pull the hood completely over your head so the hood covers the back of
your head, neck, and shoulders.
Zip the front of the hood closed by pulling the zipper slider downward.
Tighten the draw cord.
Secure the underarm straps by fastening and adjusting the straps.
d. After you have the hood in place, put on your helmet (if you have not already
put it on) and close your mask carrier.
GIVING THE ALARM
If you suspect the presence of a chemical or biological agent and do not have
your protective mask on, stop breathing and put on your mask and hood. Once you are
masked, give the alarm to warn other soldiers to put on their mask and hood
immediately. The alarm can be given verbally by yelling "Gas!" or by giving the hand
and arm signal (figure 8-1). Give the warning if one of the following occurs.