Fighters for the Islamic State are sick of getting paid so little and face questions about the way they fill out requests for vacation days, newly leaked documents reveal.

The documents, taken from the corpse of Abu Ali al-Iraqi, an Islamic State commander killed in July, include details ranging from the militant organization's pay scale to some of the difficulties Islamic State administrators face in their efforts to deal with highly variable prison populations.

"Note: the security brothers have grievances as regards salaries during their work in the area," said one letter included in the document trove, published by the Daily Beast on Tuesday. A salary table for a "mujahid," or holy warrior, indicated the monthly salary alotted to one fighter was just $50. Subsidies for dependents, including wives, parents and sex slaves, could increase the payout, with each having the potential to justify another $50 subsidy every month.

It's also critical for the caliphate's fighters to request vacation days correctly, as failure to do so could lead to questions about their fealty to Islamic law. "All brothers should be precise about dates, otherwise, they will be questioned according the Shariah law," said another document.

Those who fail to comply with Shariah law, or who commit other misdeeds, are lead to a detention facility managed by the Islamic State, which could face overcrowding. A letter written by Dr. Abu Sham to Abu al-Abbas al-Jazrawi, the vice emir of the Islamic State's justice division, sought to explain the temporary overcrowding that took place in a facility around Damascus.

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"Well, three-fourths of these prisoners were detained only for a few hours," Sham wrote. "Last month, [nobody] was detained for a period of one week except the last 3 persons mentioned at the end of the list. By the time of writing this letter to you, there is no one in the prison."

Sham chalked the issue up to bureaucrats who failed to fill out the approprirate paperwork. "The main problem about the paper that was sent from the Diwan [department] is that it didn't mention the release dates. As from next time we will add the release dates so this confusion won't be repeated again."

The documents were provided by Maher al-Hamdan, a media spokesman for the Syrian Ahmad Abdo Brigade, which is backed by the United States and other Western forces.