It may be allowed if you reasonalbly expected to be in that base for less than a year. Examples would be if you are TDY'd somewhere and your company doesn't pay for a hotel, then it is deductable. Or, if you go to NYC to get the first upgrade and then are awarded another base giving you the reasonable assumption you will be there less than a year, then it might be deductable.
Other than that, you can deduct it and hope you don't get audited. Chances are you will get away with it. LOTS of people write off crap they shouldn't knowing that statistically speaking, you are very unlikely to get audited. Don't forget that if you do get audited and the IRS see's your doing this stuff, they will audit you back three years and nail you hard. If you get caught, you will spend alot more than you are making by including stuff that is not deductable.