His Black Hawk helicopter was shot down by enemy fire on June 9.
Wisniewski and two other airmen aboard the aircraft were wounded, and four others killed.
He was hospitalized in Germany and then transported to the National Naval Center in Maryland, where he died..
"We need a presence in Afghanistan," said Jean Hancock, of Nashville. "I do not like the idea of our soldiers getting killed. I feel we should give them everything they need to make it as safe as possible."
"It's the right thing to do," said Frank Barbee, of Valdosta. "I don't think they should be over there years and years from now. Hopefully, we can bring 'em home within the next year or two and the job will be done."
Wisniewski was awarded the Purple Heart last month.
He was stationed at Nellis Air Force Base in Nevada.
The cause of the accident is under investigation.