MIL-STD-1477C(MI)
5.1.4.3 Box. A modifier in the shape of a square box surrounding the basic symbol is also acceptable as an alternative to reverse video or brackets.
5.1.5 Color.
5.1.5.1 Use. In order to maintain monochrome CRT compatibility and enhance the primary shape coding, color shall be used as a redundant coding scheme. To maintain good color perception, color symbol luminance should be at least 3 cd/m2. A luminance ratio of not less than 5:1 and not more than 10:1 should be maintained for color displays. To maintain the integrity of display symbol color coding and minimize adverse visual effects that might result from red (dark adapted state) or blue-green lighting, which ambient illumination of the crew workspace should be used. For workspaces providing other than white illumination, colors or display symbols may be modified to allow efficient operator discriminability.
5.1.5.2 Color scheme. The color specified refers to a class of hues, not to a specific wave length. The hues used should maximize the color contrast. The display should have a dark background to maximize the visibility and discrimination of the colors. Application of color to Army symbology shall conform to the following:
a. Red - Used to depict hostile ground units, installations, equipment, ground and air environment control measures), and track symbols, plus any battlefield geometry representing danger zones.
b. Yellow - Used to depict unknown ground units, installations, equipment, and track symbols, and induced nuclear, biological, or chemical contamination areas.
c. Green - Used to depict friendly ground units, installations, equipment, ground and air environments (control measures), and track symbols, plus any battlefield geometry representing safe zones.
d. Cyan - Used to depict neutral ground units, installations, equipment, ground and air environments (control measures), and track symbols.
e. White - Used to depict alphanumeric data, status information, and other battlefield geometry; e.g., boundary lines.
f. Blue - Should not be used except where conditions require a fifth color to depict non-critical information, and where the use of blue provides adequate contrast with the display background for required legibility.
5.1.6 Symbol overlap. When symbols used to depict zones or areas overlap, the underlying lower priority areas which are covered by the highest priority area shall use a dashed-line structure. Overlapping track symbols shall not result in any track symbol blanking or line structure change. Preservation of all track symbols is essential
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