Your search for "538th engineer battalion" revealed the following:

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  US Army 538th Engineer Battalion Unit Crest (NIL ARDUI EST)

  538th Engineer Battalion Unit Crest — USA-M...

  $13.95
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  US Army 538th Transportation Battalion Unit Crest

  The Unit crest has been proudly made in the ...

  $13.94
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  548th Engineer Battalion Custom made Cloth Patch

  Custom crafted patch please allow extra time fo...

  $25.00
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  US Army 495th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 495th...

  $17.54
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  US Army 548th Engineer Battalion Left Facing Unit Crest

  The US Army Military Insignia for the 548th...

  $19.94
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  US Army 577th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 577th...

  $12.74
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  US Army 548th Engineer Battalion Right Facing Unit Crest

  The US Army Military Insignia for the 548th...

  $19.94
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  US Army 588th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 588th...

  $12.80
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  US Army 355th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 355th...

  $12.68
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  US Army 505th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 505th...

  $13.94
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  US Army 397th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 397th...

  $12.80
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  US Army 536th Engineer Battalion Unit Crest

  The US Army Military Insignia for the 536th...

  $13.94