Any model builders here?

Here are the models I've done so far since surgery (about 3 months).

The aircraft are deliberately in pairs, 2 on the left and 2 on the right. Can you tell what they are and the significance of the the pairing?

In front is a 1/48 scale Panzer III tank. It's the same scale as the planes. I was surprised at how small it actually is considering the real one weight somewhere in the vicinity of 30-35 tons.

Also in front is a 1/700 scale submarine that represents my silly streak. Technically, it's the USS Baleo. Can you guess where the idea of a pink submarine would come from?

20180415_220557.jpg