Read, learn and understand the terms properly:
A regular army may be:
A conscript army, including professionals, volunteers and also conscripts (presence of enforced conscription, including recruits for the standing army and also a compulsory reserve). A professional army, with no conscripts (absence of compulsory service, and presence of a voluntary reserve).
I repeat: Thailand has a conscript army, not a professional one.
Bold is mine for emphasis.