To the OP: This is my first "advice" post. Hopefully, others will comment with advice for you AND me.
1st of all: Thank you for serving.
In order to get the most out of the advice you seek, you need to provide a lot more information. Here is a great link that tells you the information this community would like to see from you. You might want to re-post there with more information included.
http://forum.mrmoneymustache.com/ask-a-mustachian/how-to-write-a-'case-study'-topic/Here is what I can say based on the information provided:
You are really kicking it. Congratulations. 27 y.o pulling in 75k. WAY TO GO. Saving about 50% of income is FANTASTIC.
I am 46 now. At 27, We were frugal like you, but back then, FIRE was not even a formulated idea yet, so we weren't thinking about FIRE. The wife and I were living simply and investing the rest, without any real reason why we were doing it and no focused plan. You are already way ahead of us om this front.
As Dee stated, your goal may be WAY too high. We cannot know for sure, because the only thing that matters is what you plan to spend in retirement. Your post said almost NOTHING about spending. That is really all that matters to you at this point. Here is my advice to you:
1. Figure out how much you spend now. This step sucks, but it must be done. You will most likely see glaring mistakes in your spending. It is humbling, but then allows you to act to change it. Embarrassingly, my wife and I did this about 15 years ago, but then expenses went way up without paying much attention (we did not have a FIRE goal then and were saving so much so why pay close attention. Oops :( lesson learned, but it took too long). Once we got serious about FIRE, those spending mistakes improved. We now consider this a permanent work in progress.
2. Try to calculate how spending might change in FIRE, in BOTH DIRECTIONS. Big changes to this might be travel, healthcare (will you get help here being a veteran?), and spending for your job and housing. Are you a rent-only often-moving military person, or a 9-5 one location person while in military. Will that change once your service is up?. This step can be fun, because you get to add "dream" spending to see if the numbers work out, like a $10,000 annual travel allowance.
3. Pad your FIRE number as a safety net (or agree to yourself FIRE will include some part time income adventures).
4. Now you have your better estimated FIRE number. Now you are ready to ask your question from your first post. Step #1 should clearly show you where you can trim.
Here is a jump start on step 1 based on what you have told us so far:
You spend the following annually:
75,000 (salary) - 18,000 - 5,500 - 6,000 - 6,000 = $39,500 Make sure this is correct before continuing.
My first question to you is: If my calculation is correct, how are you going to spend 2.5 times current spending EVERY YEAR of FIRE? That may be correct, but only you can say for sure.
If your step #2 say's you will spend exactly the same amount in FIRE, your new FIRE number might be $1M instead of $2.5M, putting you at 15% of your goal.
As far as where to put your stache, am I seeing that Lending Club is close to 10% of your savings? That might be a little high, but I have no experience with peer-to-peer lending. This investing option is rather new, and has not been through enough bull/bear cycles in my opinion to risk much more than a "play" amount of my portfolio (<5%). As for the rest, we have no idea where it is to give an opinion to make it better.
For example, what is the breakdown of the 2050 fund? Is it 90/10 stocks/bond, 50/50, 10/90. What is the robot buying in Lending tree? Are you 100%high risk, 10%? The "Other Vanguard funds" could be in anything. Your post does not say. I do love low cost index funds, but it is important to decide what % you want in each category, and then purchase and adjust accordingly. You might think 30% large cap, 20% mid-cap, 10%small-cap, 15% REIT, 10% international and 15% bonds is appropriate for you. You might also think 100% total stock market is for you. Without knowing where it is now, we really can not give good advice as to how to change it.
I think you are in much better shape than you realize. Congratulations, and good luck.