Generally no but you should contact Medicare for a full answer.
For the most part active duty service members have military medical care in military facilities. Under certain circumstances the military pays civilian medical facilities to provide care to active duty service members. The families of active duty military personnel have a health care plan called TRICARE Prime which is similar to an HMO. Active duty service members and their dependents do not pay premiums for health care or prescription medications. Retired service members and their dependents also have military medical care and TRICARE available to them, but must pay premiums for TRICARE Prime. TRICARE Standard, which is a cost sharing plan, is also available to retired service members and their dependents. Once service members and their spouses turn 65 years of age and are covered by Medicare, TRICARE for Life acts as supplemental insurance for Medicare. Premiums for Medicare, Part B now vary by income.
You must have completed your service term in order to be eligible to recive retired military housing. It can be a great option.
can fiance's standby fly with a retired service member
This refers to insurance plans, called "Advantage Private-Fee-for-Service" plans, that one buys to accompany their Medicare since Medicare does not cover all costs (neither do these insurance plans). Many of these Advantage PFFS plans have a zero premium, hence they are called "no cost". They can offer a zero premium because this type of plan receives compensation from Medicare directly to provide coverage; in essence, Medicare is paying the monthly premium rather than the participant.
When choosing a Medicare plan, the most important item is the type of coverage for which you are looking. Medicare plans are offered as HMOs, PPOs and pay-for-service plans. The prescription medicine co-payment varies as well as premium levels.
Active duty military personnel and their dependents, and retired service members and their dependents.
You get the cards at your local base from whatever branch of the service you are in, but only if you qualify-retired military for example or military spouse, etc.
20 yrs
Any member of the US Military serves under the "needs of the service". When the service feels you are unneeded, OUT YOU GO!
United Service Automobile Association (USAA), as well as popular companies like Geico and esurance, offer discounts for members of the military (active or retired). All require proof of military service.
If you retired from the military you may wear your uniform on any occasion that is appropriate and will not bring any shame to the service. A cruise would be a great place to wear a dress uniform.
A Military Retirement Calculator extimates retired pay during retirement years. The rates of retired pay depends on the the years of service. Most retirements are after 20-30 years of service.