Just put how much exp you have and see what you will get
Recruit: Skill Needed: 0 EXP:1
Apprentice: Skill Needed: 0 EXP:2
Apprentice Grade 2: Skill Needed: 0 EXP:3
Private: Skill Needed: 0 EXP:5
Private Grade 2: Skill Needed: 0 EXP:7
Corporal: Skill Needed: 0 EXP:10
Corporal Grade 2: Skill Needed: 0 EXP:15
Sergeant: Skill Needed: 0 EXP:20
Sergeant Grade 2: Skill Needed: 0 EXP:30
Sergeant Grade 3: Skill Needed: 0 EXP:40
Gunnery Sergeant: Skill Needed: 0 EXP:50
Gunnery Sergeant Grade 2: Skill Needed: 0 EXP:60
Gunnery Sergeant Grade 3: Skill Needed: 0 EXP:150
Gunnery Sergeant Grade 4: Skill Needed: 0 EXP:300
Lieutenant: Skill Needed: 10 EXP:70
Lieutenant Grade 2: Skill Needed: 10 EXP:85
Lieutenant Grade 3: Skill Needed: 10 EXP:200
Lieutenant Grade 4: Skill Needed: 10 EXP:400
Captain: Skill Needed: 20 EXP:100
Captain Grade 2: Skill Needed: 20 EXP:150
Captain Grade 3: Skill Needed: 20 EXP:300
Captain Grade 4: Skill Needed: 20 EXP:600
Major: Skill Needed: 30 EXP:200
Major Grade 2: Skill Needed: 30 EXP:300
Major Grade 3: Skill Needed: 30 EXP:600
Major Grade 4: Skill Needed: 30 EXP:1,200
Commander: Skill Needed: 35 EXP:300
Commander Grade 2: Skill Needed: 35 EXP:450
Commander Grade 3: Skill Needed: 35 EXP:900
Commander Grade 4: Skill Needed: 35 EXP:1,800
Colonel: Skill Needed: 40 EXP:400
Colonel Grade 2: Skill Needed: 40 EXP:600
Colonel Grade 3: Skill Needed: 40 EXP:1,200
Colonel Grade 4: Skill Needed: 40 EXP:1,800
Brigadier: Skill Needed: 45 EXP:500
Brigadier Grade 2: Skill Needed: 45 EXP:1,000
Brigadier Grade 3: Skill Needed: 45 EXP:2,000
Brigadier Grade 4: Skill Needed: 45 EXP:4,000
General: Skill Needed: 50 EXP:600
General Grade 2: Skill Needed: 50 EXP:1,200
General Grade 3: Skill Needed: 50 EXP:2,500
General Grade 4: Skill Needed: 50 EXP:5,000