MEDIC!!
https://armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/ARN20654_R600_25_Admin_FINAL.pdf
It was 18, watch and count again. Just double checked it.
https://www.c-span.org/video/?c4939414/user-clip-cspan-21-gun-salute-trump-farewell-speech-joint-base-andrews