Technical Manual, U.S. War Department, October 1, 1944
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Chapter X: Equipment
Section II: Infantry Equipment
1. GENERAL. Details of infantry equipment have not been shown in this section when it has been possible to place them under specific headings. For example, personal items issued to the individual soldier have been described, where possible, under chapter 11, while weapons are treated in chapter 9.
2. OBSERVATION EQUIPMENT. All reported specimens of Japanese optical instruments have been of good quality and have been found to resemble German designs. A particularly wide range of patterns has been developed, and specimens examined have been characterized by sturdy construction. In all cases definition in the central part of the field of view was good. There are no indications that the Japanese have attempted to tropic-proof these instruments.
a. Binoculars. Details of binoculars, having a magnification in excess of 8 X, are shown in the Artillery Equipment section of this chapter. Tabulated below are the characteristics of some Japanese binoculars, of 8 X magnification or less.
3. INFANTRY FIRE CONTROL EQUIPMENT. a. Range finders.
b. Aiming and laying devices.
4. PERSONAL ARMOR. a. Model 99 (1939) armor shields, portable.
(1) General. While these shields are suitable for use in the open, specimens, constructed from what appears to be face-hardened plate, have been found built into the weapon ports of pillboxes. Two sizes have been recovered, the larger measuring 14 by 20 by 1/4 inches (fig. 293) and the smaller 12 by 16 by 1/4 inches.
(2) Penetration. Tests have shown that these shields will resist penetration by .30 caliber ball ammunition at 100 feet. However, some damage may be caused by flaking (chipping). These shields have been penetrated readily by .30 caliber AP ammunition as indicated below:
b. Body armor. (1) Bullet-proof vest. The vest (fig. 294) is made from olive-green drill cloth, with 3 pockets on each side to accommodate armor plates arranged in fish-scale fashion. Characteristics are as follows:
It is believed that the weight of this vest would preclude its general use by infantry and probably would tend to confine its use to special troops. Tests have shown that the plates are penetrated easily by .303 ball ammunition at 100 yards range, with a 30° angle of impact from normal.
(2) Body protector. No details are available concerning this body protector (fig. 295), but it is reasonable to assume that it is made from an armor plate of thickness approximating that of the bullet-proof vest. It is possible that the armor plate is in 3 sections for purposes of flexibility.
c. Steel helmets. See chapter 11.
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