Bottom line: The classic "one weekend a month, two weeks a year" is the floor, not the ceiling. What you actually owe depends on your billet, MOS, rank, and unit.
The baseline commitment
The reserve commitment is commonly described as:
- One weekend per month — a drill weekend (inactive-duty training).
- Two weeks of annual training (AT) per year — a block of active-duty days; SMCR units typically run about 14–15 days, IMAs about 12–13.
Why it's often more in practice
Many Marines perform additional days beyond the baseline for:
- Schools and professional military education
- Exercises and operational support
- Readiness requirements
- Leadership responsibilities
The actual obligation varies by billet, MOS, rank, and unit requirements — a junior Marine in a line unit and a senior Marine in a key billet can owe very different amounts. For how this is defined in policy, see the Marine Corps Reserve manual in plain English.