Actually their is a federal law that says they are supposed too -
H. R. 302—417 (FAA Reauthorization Act of 2018)
SEC. 1963. (c) amendment to include at the end of 44921(c)(2)(C)(iii)
‘‘(2) FACILITATION OF TRAINING.— An air carrier shall permit a pilot seeking to be deputized as a Federal flight deck officer or a Federal flight deck officer to take a reasonable amount of leave to participate in initial, recurrent, or requalification training, as applicable, for the program. Leave required under this paragraph may be provided without compensation.’’.
I would speak to the base management and point that law out.