I would employ you to think with longevity on this one; I do not know how much your severance would be, but purely mathematically speaking, the following is a financial outlook of both.
**All hypothetical because I dont know your numbers**
E-6 Seperated at 10 years, seperation amount approximatly (3228.00basepay X 2 X 10) = $64,560.
E-6 Seperated at age 30; Theoretically lives to age 75; (45 years of benefits )
Per month at 30%: 400.93 (currently)
Per Year at 30% : 4811.16 (currently)
Assuming NO yearly raises, which is being VERY conservative. Your total benefits not including raises, insurance, or base access, would equal $216,506.70.
If you want to get technical, and factor in a minimum yearly raise of .5% (we have not had less than a 1.5% raise in years)
Each year with a .5% raise:
4811.26
4835.316
4859.493
4883.79
4908.209
4932.75
4957.414
4982.201
5007.112
5032.148
5057.308
5082.595
5108.008
5133.548
5159.216
5185.012
5210.937
5236.992
5263.177
5289.492
5315.94
5342.52
5369.232
5396.078
5423.059
5450.174
5477.425
5504.812
5532.336
5559.998
5587.798
5615.737
5643.815
5672.035
5700.395
5728.897
5757.541
5786.329
5815.26
5844.337
5873.558
5902.926
5932.441
5962.103
5991.914
So $242,122.60 over the course of 45 years assuming your ratings come in at 30% and dont increase EVER.
$242,122.60 vs the hypothetical 64,000 issued by severance; Even if you had 20 years in you could not beat the longevity of retirement. Factor the cost of insurance into that and its really obvious...
But then again! I dont know your situation and you could find yourself in a spot that the much much less amount could benefit now.