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the maak, completely emptying the lungs, thus clearing the facepiece of gas (Fig. 124-5).

SIX. Replace headpiece, adjusting the chin strap to the back of the head. Pass the flap of the carrier around the hose and fasten on the outer snap fastener. Take the position of ~ "Trail arms" (Fig. 125).

b. Mounted.—1. By the numbers, 2. GAS. Stop breathing. Drop the reins behind the pommel of the saddle. Continue as prescril>ed for the dismounted drill. Having fastened the flap of the carrier around the hose as prescribed, take the reins.

Fig. 125.—The mask ad« justed to the face. (During the drill no equipment should touch the ground, which niighi I* <>ontnminnted by n liquid accru.l

Fig. 125.—The mask ad« justed to the face. (During the drill no equipment should touch the ground, which niighi I* <>ontnminnted by n liquid accru.l

Fro. 126.—Position in testing for gna. (Knee or equipment should not touch the ground.)

(3) To Test for Gas.—Mask being adjusted, the command is: TEST FOR GAS. Dismount if mounted. Take a moderately full breath. Stoop down so as to bring the face close to the ground but do not kneel, care being taken that the rifle does not to^ch the ground. Insert two fingers of right hand under facepiece at right cheek. Pull the facepiece slightly away from right cheek and sniff gently (Fig. 126). If gas is smelled, readjust the facepiece ami resume the erect position. Close outlet valve by pinching between thumb and fingers of right hand and blow out hard, thus clearing the facepiece of gas. Release hold on outlet valve.

t4) To Remove the Mask.—1. Remove, 2. MASK. At the command 14 Remove," drop the reins behind the pommel of the saddle if mounted; if

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