Navy Electronics Specialty (Submarine) LDO (628X) 628X is a Limited Duty Officer (LDO) designator for the U.S. Navy. It stands for Electronics Specialty (Submarine).
Officer designator codes are four-digit numbers that group officers by categories for personnel accounting and administrative purposes. They also identify the status of officers.
You know the job.
Pass the ACFT. Max the PFT. Crush the PRT. Pass the ACFT.
Daily workouts built for your fitness test, ranks and XP that keep you coming back, and a countdown to test day. Made by the veteran who built MOS Roadmap.
Army, Marine, Navy & Air Force tests Guided lifts, runs and rucks Free for 15 days
Android · early access Get it on Google Play +XP
RANK UP!
✓
You're on the list
We'll email Become a tester , then install Gruntz from Google Play.
Done Your pocket
Log every set. Smash every PR. No skipped leg day. Log every set.
Gym or home workouts, proven programs, and a coach that adjusts each session. Every set, rep and personal record logged, even offline.
Gym & home workouts Coach adapts every session Log sets from Apple Watch NEW PR!
DROP & GIVE ME 20