=7.= If any one of the sides of the triangle exceeds ⅓ inch from the instructor’s aim, the recruit will be noted for further instruction. =8. Aim-Corrector.=--The aim-corrector will also be used to enable the instructor to supervise the soldier’s methods and test his progress, the aim being taken from an aiming or firing rest. Section =19=.--Aiming at Service Targets, Aiming at Ground, and Marking Down the Enemy. =1. Aiming at Service Targets.=--From an early stage in his instruction the soldier’s eye must be trained to discern and aim at service targets. Elementary instruction may be carried out in barracks, on the range, on ground in the vicinity of barracks, or on miniature ranges. Figures should be used representing men in the various firing positions at different distances in the open, or partly behind cover. =2. Aiming at Ground.=--(i) Service targets will frequently consist of ground or cover occupied by the enemy. Fire-unit commanders will verbally indicate such targets to men, who must be trained to recognize and fire at them. This training should be carried out concurrently with instruction in aiming at figures and marking down the enemy--the latter practices to some extent will also train men to aim at ground. (ii) Practice in aiming at ground may be carried out on miniature ranges, as described in Sec. 72, para. 2 (i), as well as in open country. It must always be carried out under practical conditions, and will include aiming at various ill-defined targets, such as a spot on a bare hillside or a stretch of grass-land. Targets will be indicated verbally by the instructor, and recruits will aim at them with rifles on aiming-rests. The instructor will then criticize each man’s aim and correct faults. Practice in aiming at ground will prove a useful preparation for training in recognition of targets (Sec. 45) and fire discipline (Sec. 47). =3. Marking down the Enemy.=--(i) It is of the utmost importance that soldiers should be trained to mark down the exact position of an enemy seen to occupy ground or cover. This duty refers equally to individual enemies at close range and to hostile troops at longer ranges. Individual soldiers will mark down the enemy within close range, and fire-unit commanders and observers at longer ranges. If the position marked down affords concealment from view without protection from fire, fire may be opened after the range has been ascertained or estimated. If it affords protection from fire, the range should be ascertained or estimated, and fire-units or individual men should remain ready to open fire the instant the enemy exposes himself or resumes movement. Delay in opening fire in the latter case will lead to the loss of a favourable opportunity (see Practices, Nos. 3 and 4, pp. 217, 218).