English: Military map symbol for a friendly unit or formation. The blue frame and icon were defined in APP-6 to indicate friendly. In APP-6A, the option to use a solid "Crystal Blue" fill was introduced for friendly units. In APP-6, all units were represented by a rectangle with dimensions that varied from 1.5 by 1 to 1.7 by 1. The 1.5 by 1.0 frame was stated as the standard dimension for a friendly unit in APP-6A.