The term "CD3" in an Army context typically refers to "Conditioning Drill 3." It is one of the drills in the PRT, Physical Readiness Training
CONDITIONING DRILL 3
BTS - Proof [Compact Edition] [3 CD] - Music
Falco 3 - Wikipedia
Conditioning Drill 3 Exercise 6 - Straddle Run Forward & Backward
CONDITIONING DRILL 3
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Power Up Your Kickboxing with Dynamic Conditioning Drills
Conditioning Drill 3
Political notes: Ad wars in CD-3, Alsobrooks and Trone amp up endorsements - Maryland Matters
CONDITIONING DRILL 3
3 Functional Conditioning Drills for Superior Fitness
Mini CD - Wikipedia