Yes. According to the instructions for form 3903 (extracted below) the unreimbursed cost for storing household goods while stationed overseas is a deductible moving expense. Use the "Moving Expenses" topic in the "Other deductions..." dropdown in the "Deductions & Credits" Section.
"Foreign Moves
A foreign move is a move from the United States or its territories to a foreign country or from one foreign country to another foreign country. A move from a foreign country to the United States or its territories isn't a foreign move. For purposes of determining whether a move is a foreign move, a U.S. military base is not a territory of the United States and moving to a U.S. military base located in a foreign country is a foreign move. For a foreign move, the deductible moving expenses described earlier are expanded to include the reasonable expenses of the following.
- Moving your household goods and personal effects to and from storage.
- Storing these items for part or all of the time the new job location remains your main job location.
- The new job location must be outside the United States."
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