This may help from TB 43-0147 Decmber 1975 relating to the star placement if you cannot find what you are looking for.
2-2. National Symbol. a. The national symbol is
a 5-pointed star of lusterless white, Color Chip No.
37875. It will be applied to all tactical and combat
vehicles and appropriate equipment in CONUS and
oversea. The national symbol will be applied at the
depot to vehicles and equipment in storage only when
withdrawn for issue to the US Army units. It will not be
applied to ambulances or other medical service vehicles
affected by international agreement concerning such
vehicles.
b. The marking will normally be applied to the
front, rear, both sides, and top of the vehicle. The
symbol may be applied to mounted equipment on
vehicles when such equipment provides the most
suitable surfaces. It will not normally be applied to
canvas surfaces.
c. The National Symbol marking will be
located on the largest regular area and as near as
possible to the center of such area. It will not be applied
in a location where it will, in normal usage, be obscured
by paulins, canvas doors, folded-down windshields,
gasoline cans, communications equipment, or other such
items.
d. Top surfaces for application of the National
Symbol on transport vehicles will be in the following order
of preference:
(1) Roof of vehicles with hard roof bodies.
(2) Top of cab on vehicles with hard roof
cabs but not having hard roof bodies.
(3) Top of hood when no other suitable
hard surface of adequate size is available.
e. On horizontal surfaces the star will be
applied with one point directly toward the front of the
vehicle or equipment. On vertical surfaces the star will
have one point directly up.
f. The star will be applied in either of the two
methods of permanent marking, stencil-and-paint or
pressure sensitive adhesive vinyl. Vinyl markings will not
be used on highly irregular or rough surfaces where
adhesion would not be complete. National Symbol
markings at different locations on any one vehicle or
piece of equipment may be applied in different methods.
g. The National Symbol will be the largest size
practical for use in the available space, but will not
exceed 36 inches measured between opposite points.
The star will not be applied in sizes less than 6 inches
between opposite points.