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Mechanized with Mechanized Gun Mounted or
Guns mounted or Has Heavy Weapons
with Heavy Weapons
These are both modifier symbols; lacking a primary type symbol, it implies mechanized untrained troops with either vehicular guns or with heavy infantry weapons.
For example, think installing an RPY on an unarmored G-Carrier, and using it for troop transport.
Or, a unit of non-infantry pressed into rifleman use with jeeps and everyone (except medic, pigman, and if needed, EW/Comms) having an URGL and 20 rounds of AP for it.
Note: The central bar is deprecated by 2004, when ADP 1-02 was published. Mech Inf are combined armor rounded rectangle and infantry X.
Motor rifles in tracks would be the infantry X with a small armor rounded rectangle in the bottom center (under, not crossing, the X); in wheeled, they'd now/again be shown by two or 3 wheels instead of the small track rounded rectangle.
Note that the Stryker symbols in ADP 1-02 2004 still shows one with a left hand bar for the guns on their mobility. (A-4/2 7ID)