For Principals Public Elementary and Secondary School: 3127. D.O MEMO NO. 18, 2016. GUIDELINES ON THE DEPED NATIONAL UNIFORMS FOR TEACHING AND NON-TEACHING PERSONNEL Posted on May 13, 2016 by MSM13 Leave a comment 3127. D.O MEMO NO. 18, 2016. GUIDELINES ON THE DEPED NATIONAL UNIFORMS FOR TEACHING AND NON-TEACHING PERSONNEL Memorandum