Is it legal to scan a military id?

The photocopying of U.S. Government identification cards is a violation of Title 18, U.S. Code Part I, Chapter 33, Section 701 and punishable by fine and imprisonment.

Title 18, Section 701 of the U.S. Code and the DoDI 1000.13, paragraph 6.1.7. authorizes the photocopying of the front and back of the ID card or CAC to establish the eligibility of the patient to receive care.