| Benkert, Robert L.; ISMA Directory; 1973 | ISMA Directory | 1973-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1976 | ISMA Directory | 1976-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1980 | ISMA Directory | 1980-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1983 | ISMA Directory | 1983-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1984 | ISMA Directory | 1984-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1985 | ISMA Directory | 1985-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1986 | ISMA Directory | 1986-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1987 | ISMA Directory | 1987-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1988 | ISMA Directory | 1988-00-00 | | Captain |
| Benkert, Robert L.; ISMA Directory; 1989 | ISMA Directory | 1989-00-00 | | Retired |
| Benkert, Robert L.; ISMA Directory; 1990 | ISMA Directory | 1990-00-00 | | Retired |
| Benkert, Robert L.; ISMA Directory; 1991 | ISMA Directory | 1991-00-00 | | Retired |