Generally, meals are not deductible unless they are incurred in promoting business activities (100% for employee meals, 50% for customer meals).
In your case, they are deductible as unreimbursed employee expenses, but the limitations are severe.
First, you received BAS which is considered reimbursement for your meal expenses.
Any remaining, unreimbursed meal costs are reported as deductions on Schedule A (assuming you itemize). Those deductions are subject to a 2% AGI limitation which means you would only see a benefit for the amount that exceeds 2% of your AGI.
The following article discusses Military Tax Deductions in greater detail, but my personal experience (30 years myself, and 6 children on active-duty - two of which are currently deployed) is that the 2% AGI limitation pretty much negates any benefit.
http://www.militaryauthority.com/benefits/finance/taxes/overlooked-military-tax-deductions.html
