Developer for System z Enterprise COBOL for z/OS, Version 4.1, Compiler and Runtime Migration Guide
Implicit EXIT PROGRAM
To end a program, you must use an EXIT PROGRAM, STOP RUN, or GOBACK statement.
You can use an EXIT PROGRAM for a called subprogram; you can use a STOP RUN
for a main program. GOBACK, an IBM extension, can be used for either type
of program.