Blackhawk

Blackhawk debuted in Military Comics #1, in August 1941 and was featured in this publication for a number of years as well as in his own self titled comicbook. 

 Created by Will Eisner, Bob Powerll and Chuck Cuidera, Blackhawk was first published by Quality Comics, and later by National Periodical Publications (which turned into DC Comics).

The Blackhawks are a small group of WWII ace pilots.

Original Team

Blackhawk is the group's leader. He was originally identified as Polish, but later issues referred to him as American. His actual name was unknown until Blackhawk #242 (Aug.-Sep. 1968) revealed that his name was Bart Hawk, an American of Polish extraction.
Andre (last name unknown) is French.
Olaf Bjornson is from Norway.
Chuck Wilson is a Texas-born American.
Hans Hendrickson is Dutch.
Stanislaus (last name unknown) is Polish.
Chop-Chop (named Liu Huang in Blackhawk #203; Mark Evanier named him Wu Cheng in Blackhawk #251 to 273), is Chinese.
Zinda Blake (Lady Blackhawk) is American.
 
Other short-term members:
 
Zeg is Polish
Boris is Russian
Baker is English 
Lt. Theodore Gaynor, USMC is American.
 Miss Fear, who never formally joined the team, but appeared repeatedly as an ally in the 1940s.

Chaykin Team

In 1987, comics innovator Howard Chaykin updated the Blackhawks with more adult characters.

Janos Prohaska (Blackhawk) their leader, is Polish.
Andre Blanc-Dumont is French.
Olaf Friedriksen is Danish.
Carlos "Chuck" Sirianni was born in Italy but raised in Hoboken, New Jersey, United States.
Ritter Hendricksen is Dutch.
Stanislaus Drozdowski is Polish.
Weng Chan (Chop-Chop) was born in China but raised in San Francisco, California, United States.
Natalie Reed (Lady Blackhawk) is American.

Other members:

Grover Baines is American.
Quan Chee Keng, a.k.a. "Mairzey" is Malaysian. 
Paco Herrera is Mexican.