Let's start with what the different blocks mean.
BOX 1 Is your taxable Earnings (Total money received less certain exclusions)
BOX 2 Is the Federal Tax that was withheld from BOX 1
Box 3 & 5 are Social Security & Medicare Income respectively
NOTE: Boxes 3& 5 are usually the total value of everything you received with a few exceptions)
I noted that you stated that a portion was reserve pay. That suggests that you have another job. If you work multiple jobs, or if you have a spouse that works, you may not have had enough taxes withheld.
Each job that you work will calculate the tax withholding for that job alone. As you add additional W-2's your income will continue to go up, but the amount withheld will be at a lower taxable rate.
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