Pros
20-year retirement. Significant promotion opportunities for people with moderate abilities, but who are happy to maintain the status quo and jump through the appropriate hoops. Reasonably nice benefits package (health for life if you make the 20-year retirement). Ability to travel and live in many locations. Great pay for low-skilled work.
Kontras
Deployments. The same moderately enabled people being promoted above you just because they have longevity on their side. The vast majority of senior leadership who have been Peter-principled, are simply unqualified or remain in the Navy only because they know they have no opportunities on the outside. The need to move constantly (9 times in 12 years!) Poor pay for most technical personnel.