MOP, Bk 3, v. 4, 320
“1. No official or employee of the Government, while undergoing trainee instruction or who, upon completing thereof, shall have been selected for additional training to qualify him as a commissioned or non-commissioned officer of the Reserve Force, or who shall have been called to regular annual active duty training, or to extended tour of active duty in the Philippine Army, in case he holds a commission in the Reserve Force, shall be compelled to lose his position or to suffer any decrease of pay whatsoever due to his absence in the fulfillment of his military obligations.”Done at the City of Manila, this fifth day of September, in the year of Our Lord, nineteen hundred and thirty-eight, and of the Commonwealth of the Philippines, the third.