Where can I find the military PDA for the safe in the Bariga Stash?

Having determined the location of the cache using the screenshot below, go in search of three PDAs with three parts of the code:

As a result, you should get the following:

• The senior lieutenant is in the room with the safe itself, his part is 26.
• The sergeant is on the left side of the building, he has 57.
• The private's code is 19.
• It turns out - 195726