Officer Equipment Level 1 unlocks the first 2 Stats (upgrade with Officer Equipment Alloy)

Officer Equipment Level 5 unlocks a 3rd Stat (upgrade with Officer Equipment Alloy)

Officer Equipment Level 10: unlocks the 1st Equipment Expertise Skill (upgrade with Officer Equipment Essence Stone)

Officer Equipment Level 15: unlocks 2nd Equipment Expertise Skill (upgrade with Officer Equipment Essence Core)

The current Officer Equipment max level is Lv30, Officer Equipment Expertise Skill max level is Lv15.