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  | MILT81821 
On all trainers classified CONFIDENTIAL or higher, the inner 
3.3.3.7.1 Security cover. 
fabric security cover shall be marked with the appropriate security classification in red letters not 
less than two (2) inches high. These letters shall appear against a white or similar high contrast 
background. The security classification shall not be indicated on the exterior of the outside cover. 
A weatherproof decal with instructions for removal of 
3.3.3.7.2 Removal of hard cover. 
the hard cover and installation of the casters shall be placed on the cover near the caster access 
door. 
A vertical red arrow, approximately 2 by 6 inches, shall be 
3.3.3.8 Center of balance. 
stenciled on both longer sides of the trainer frame and outer cover, near the bottom edge, to 
indicate the point of balance of the trainer for forklifting. At the top of the arrow, in red letters not 
less than 1 inch high, shall appear the legend CENTER OF BALANCE. If space is not available on 
the trainer frame for the 2-by 6-inch arrow, a red triangle or dot will be sufficient. 
When modified, 
3.3.3.9 Marking of trainer with modified, rejected or non-operable parts. 
rejected or non-operable parts are used, the trainers shall be appropriately marked by metal plate, 
decalcomania, etc., as follows: 
P A R T S AND COMPONENTS OF THIS TRAINER WHEN INDIVIDUALLY 
MARKED MODIFIED, REJECTED OR NONOPERABLE ARE TO BE USED 
FOR GROUND TRAINING PURPOSES ONLY. 
3.3.3.10 Marking of modified, rejected and non-operable parts. 
Modified parts which by 
means of depot level overhaul could be returned to Ready For Issue/Serviceable (RFI) condition for 
operational use on the related end item shall be appropriately marked by stenciling or decals as 
follows "MODIFIED  NOT FOR OPERATIONAL USE". All rejected, non-operable parts and 
those modified parts which could not by means of depot level overhaul be returned to RFI 
condition' for operational use on the related end item shall be individually and permanently marked 
by stamping or engraving "REJECTED  NOT FOR OPERATIONAL USE". Where the size of a 
part renders marking impractical or ineffective, the next higher assembly in which the part is used 
shall be so marked. Such marking will not be required on obviously cutaway parts. 
3.3.3.11 Electric motors. 
All trainer peculiar unidirectional electric motors shall be marked 
to indicate direction of rotation. 
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