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11 Cards in this Set
- Front
- Back
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- Remain motionless while observing. Anything in motion attracts the eye.
- Use all available concealment because it offers a low silhouette and makes detection by the enemy difficult. -Expose nothing that reflects light. - Blend with the background because contrasting colors are noticeable. |
Avoid all unnecessary movement.
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- Remain in the shade because moving shadows attract attention.
- Distort or change the regular outline of objects. Most military objects have distinctive shapes that make obvious shadows and silhouettes. - Avoid the skyline. Figures on the skyline can be seen from great distances and are easily identified by their outlines. |
Avoid all unnecessary movement.
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- The technique of viewing an object using daytime central vision is ineffective at night. This is due to the night blind spot that exists during low illumination. Marines must learn to use off-center vision.
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Search field of view using the off-center vision method
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This technique requires viewing an object by looking 6 to 10 degrees above, below, or to either side of the object rather than directly at it.
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Search field of view using the off-center vision method
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- Scanning enables the Marines to overcome many of the physiological limitations of
their eyes. It can also reduce confusing visual illusions |
Search field of view using the scanning method.
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This technique involves looking from right to left or left to right using a slow, regular scanning movement as shown in figure 1. At night, it is essential to avoid looking directly at a faintly visible object when trying to confirm its presence.
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Search field of view using the scanning method.
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- In daylight, look first at the ground nearest you. Begin observing close to your post and search a narrow strip 50 meters or less deep, going from right to left parallel to your front.
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Search field of view using the strip method.
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Then search from left to right a second and similar strip farther away, but overlapping the first. Continue to observe until the entire field of view has been searched as shown in the below figure.
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Search field of view using the strip method.
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- When entering a lighted area or observing in a temporarily lighted area such as illumination and flares, one eye should be closed and covered to preserve its night vision.
- When the light goes off, fades, or the lighted area is exited, the night vision retained by the protected eye enables it to see until the other eye adapts to the darkness. - Red light helps preserve night vision, but like white light, it can be observed at long distances. |
Preserve night vision when subjected to lighted areas or illumination.
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- Factors that decrease night visual acuity include fatigue, lack of oxygen, long exposure to sunlight, alcohol, nicotine within the pass 48 hours, and age.
- When night vision has been attained, straining will not improve effectiveness; however, practicing to identify objects at night will improve perception. |
Preserve night vision when subjected to lighted areas or illumination.
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- Hearing is amplified with the mouth open.
- Removing the helmet will reduce sound distortion. - By holding the ear close to the ground, sounds of people walking and vehicles moving can be heard |
Demonstrate techniques that enhance hearing.
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