Was filmed on property formerly owned by the Dupont family in Deleware.
Even though it was set in winter, and in fact filmed in winter, the weather wouldn't co-operate and it was in the 50s and 60s Fahrenheit. All the GI extras had to wear layers of clothing and spent many a scene sweating it out under them.
Part of the film was shot in a park where it was discovered discharging blanks was illegal. All shooting scenes then had to be adjusted to be filmed on the DuPont property.