Here are some useful links for pre-retirees or retirees with some current or former military connection. Anyone who cares to add links to this thread should message me.
Pentagon Federal Credit Union - unusually good rates on cd's and other savings products. Who is eligible and how can I become a member? https://www.penfed.org/howToJoin/overview.asp
Navy Federal Credit Union - also has great rates on cd's. Who is eligible and how can I become a member?
USAA -- very good insurance, banking and investment products. Who is eligible and how do I join?
Navy Mutual Aid Association - life insurance for those connected with the sea services. Who is eligible and how do I join?
Eligibility to Join Navy Mutual
Army and Air Force Mutual Aid Association - life insurance for soldiers and airmen. Who is eligible and how do I join?
AAFMAA - Soldiers and Airmen
Armed Forces Vacation Club -- discounted vacation/resort rentals for military families. (hat tip to r23748 for the link)