Hi, Cali! One thing that isn't widely known...since your husband is active duty military, you receive preference over other applicants when being considered for a GS position (the other preference is if you yourself were ever active duty). I found that out when I applied for (and was accepted for) a GS CST position in Hawaii, where my husband is stationed. As for the conditions, zmorgan hit in on the head when it comes to military staff being deployed, it can create a bit of a crunch when it happens. But most people tend to come together very well and work with each other to get the job done. And depending on where you work, backfill nurses are sometimes sent from other military bases to help ease staffing. The patient population you would work with is pretty healthy, generally speaking.
I'm not sure what GS level you would apply for as I don't know your area, but the L&D GS nurses I work with are at GS-11 (I believe they're working on moving the position to GS-12.). There are ranks within each level called "steps" that also affect what your pay level is (example: GS-11, step 1). Your step/pay will go up the longer you stay in the system. The benefits are great (although you will get healthcare through your husband/Tri-care instead of the GS program).
And yeah, get ready for a mountain of paperwork to fill out, hehe. Just be sure to tell whoever you speak with that your husband is AD if/when you choose to apply. Even though there was a lot to do for the application, the HR person I kept in touch/spoke with was very helpful to me in getting everything done. As for transferring, it shouldn't be a problem at all with transferring with your husband as you all PCS. Just before our PCS to Hawaii, I didn't check the web to see what positions were open (though this may help you get an idea of what's there). I called the Tripler GS liason, let her know I was on my way there with my husband and was interested in working there, and she put me in touch with the right people.
After I finish nursing school, GS is definitely an option I will be looking back into. Overall I think the environment is very nice.
Also, here are some links you may like to check out. I'm assuming your hubby is MC? If so, I think their civilian personnel office would be the best bet for transferring with him. The SITES page will give you, quite literally, all of the information you will need for a future PCS when you get orders (info on a new station, phone numbers, what military health care facilities are available, etc.). Just need your hubby's info to access the page, it's a gov't protected site. Clicking on *Select Installation* should get you going. They just revamped the site. I haven't had a chance to go through it all, but it looks pretty nice, and is very user friendly. Hope this helps some!
USMC Civilian Personnel: https://lnweb1.manpower.usmc.mil/CCLD/index.htm
SITES website: https://www.dmdc.osd.mil/appj/sites/index.jsp