Cape Canaveral, Fla. -- Retired space shuttle astronaut Sam Durrance greets spectators from a Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired space shuttle astronaut Loren Shriver Hauck greets spectators from a Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired Apollo astronaut Edgar (Ed) Mitchell waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. – Suzan Cooper, representing her late husband Mercury 7 astronaut Gordon Cooper, waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Kennedy Space Center Director and former space shuttle astronaut Bob Cabana waves to spectators from a Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired shuttle and Skylab astronaut Dick Lousma greets spectators from a Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired space shuttle astronaut Don McMonagle waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired Gemini and Apollo astronaut Dick Gordon waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Kennedy Space Center Director and former space shuttle astronaut Bob Cabana gives a thumbs-up to spectators from a Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. – Retired Mercury 7 astronaut Scott Carpenter waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. – Laura Shepard Churchley, representing her late father Mercury 7 astronaut Alan Shepard, waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired space shuttle astronaut Susan Kilrain waves to spectators from a Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired space shuttle astronaut James Reilly waves to spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired Apollo astronaut Walt Cunningham greets spectators from a vintage Chevrolet Corvette during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett

Cape Canaveral, Fla. -- Retired payload specialist John-David Bartoe greets spectators during a commemorative parade in Cocoa Beach, Fla. A group of current and retired NASA astronauts gathered in Cocoa Beach to commemorate NASA’s 50 years of accomplishments and to honor astronaut Alan Shepard’s Mercury/Freedom 7 suborbital flight May 5, 1961.The event was marked by a parade, with the astronauts riding in a fleet of Chevrolet Corvettes that corresponded with the time period of their space missions. Members of the Cape Kennedy Corvette Club, a group established in 1967, escorted almost two dozen astronauts or their family representatives in club members' cars. The Corvette parade started at the glass bank building, at 9:34 a.m. EDT, the same time Shepard launched into space. Photo credit: NASA/Kim Shiflett