Increase the age of full retirement benefits -- gradually so it doesn't hurt those soon to retire -- as was done already. But raise the age further. the average life expectancy when SSA was enacted was a lot less than now; 70 or there abouts would be good. Keep exceptions for the ill, infirm, disabled, etc, but raise it for the rest.
Currently, the National Guard retirement starts at age 60, but active duty can start collecting retirement the day after they retire - even if they are 40 years old. I propse that the age that active duty personal can start to collect returement is moved to age 60. This should be done over several years but potentially will save billions in pension dollars.