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In 2016, fuel prices on the open market plummeted even more, enabling the Pentagon to build an even bigger surplus in the working-capital fund.

All told, the Pentagon has withdrawn a total of $5.9 billion from the working-capital fund since 2011, according to figures provided by the Defense Department.

When fuel prices spike upward, he said, the Pentagon sometimes must raid other accounts to pump more money into the working-capital fund for fuel.

The memo said the unplanned increase was necessary “to ensure the continued solvency” of the Pentagon’s working-capital fund for fuel.

In 2015, as petroleum prices on the open market were plunging, the working-capital fund amassed an even bigger surplus.