They're completely different shows. The only similarity is they both take place during WWII and are "ensemble" style shows. In a way they're also similar as both are somewhat a "caper" show in that they're trying to get away with something that's outside the norm/rules, bypassing authority to...
If you don't care for military themed TV shows then don't make the purchase or at least find a way to watch a few episodes before making the purchase.
It's about a PT boat crew stationed on an island chain in the Pacific (close to Australia). Even though it's a Navy themed show there's...