The same year that ABC had introduced the sitcom, McHale's Navy, they also debuted a 2nd series set in World War II.
Combat! outlasted McHale by 1 year, as it ran for 5 seasons (1962-7), and continues to air around the world today, including late night & weekend airings on Me-TV.
I wish I could rightfully say I remember seeing this series, but I don't, even as a toddler. Therefore, there won't be a rating. Unlike McHale, Combat! was produced virtually in-house by network executive Selig J. Seligman's production company.
Here's the open: