The main difference between Active Duty service and Guard service is Operational Tempo (OPTEMPO), or number of training and deployment days.
Your National Guard Special Forces training is one weekend (three to four days) per month plus an additional two to four weeks of training per year. Deployments are also less frequent. You will generally be deployed once every two to three years for six to 15 months. This allows you to live as a civilian as well as a Soldier.
A National Guard Special Forces Soldier must maintain the same certifications, currencies and qualifications, as well as attend the same military courses and schools, as Active Duty Army Special Forces.
Army National Guard vs. Active Duty Special Forces