Age of Rebellion Character Creation Duty Question

Hi, I have GMed an Edge of the Empire campaign and am now running my first AoR campaign. I have a question regarding the optional duty reductions. I can't for the life of me figure out if players can start with 0 duty. Technically it falls in the two limitations the rules state:

"There are two limitations on this: each player can choose a particular option only once, and Player Characters cannot spend more Duty than their original starting value."

So my players start with 10 duty, can they just go for the -10 duty reduction and have 0 starting duty? Because it sort of feels weird if their duty value is not even possible as a roll when I roll the d100 at the start of a session.

Thanks in advance!