In my case, it's my wife but YES, I think needing anything, including me, is one of her greatest fears. Perhaps this is part of the personality of people drawn to the military. She is afraid to need or be vulnerable, and has specifically told me that she does not want to be in position of dependence because as you said, there are times she simply won't have me, or whatever she is dependent on.
We met right after she returned from an Afghanistan deployment and it took me a long time to really understand what it is like for military members to have such large segments of their lives where it's just them and the basics. They don't have to worry about all the complexities of life while they're in the desert. Do your job, eat, gym, and sleep pretty much. It can be a hard adjustment where they get whiplashed back into all the craziness of normal life. When they have a spouse, I think we do take on a lot of this everyday stuff for them and keep it running. In my case, I think she is inevitably somewhat dependent (not necessarily in an unhealthy way) and resents it.
M: 26 W: 26 M: 1.5 T: 3 No kids BD: 31 March 2018
W's affair began: 23 March 2018 Affair confirmed: 18 April 2018 Confrontation/claims she ended A: 14 May 2018 Ended in-house separation: July 2018