The suborbital flights

Alan Shepard flew Freedom 7 on May 5, 1961, becoming the first American in space. The Mercury-Redstone flight was suborbital: its path returned to Earth without circling the planet. Reaching space describes altitude; remaining in orbit also requires sufficient sideways velocity.

Imagine throwing a ball progressively faster across a curved Earth, ignoring air resistance. Increasing height alone is not what makes the path miss the ground continuously. The analogy explains the distinction; it is not a numerical model of the actual Redstone trajectory.

Gus Grissom flew Liberty Bell 7 on July 21, 1961. After splashdown, its hatch released and water entered the capsule. Grissom was rescued, but the capsule sank. An account should distinguish the successful flight from the loss during recovery and avoid assigning unsupported personal blame for the hatch event.

Recovery teams had to manage a person and a spacecraft in an ocean environment. Flotation, aircraft, ships, communication and weather mattered. The landing location was therefore a planned part of operations, rather than an empty patch of map where the spacecraft stopped flying.

These flights supplied experience with an astronaut aboard during launch, short weightlessness, manual tasks, entry and splashdown. They did not demonstrate a full orbit or a day-long stay. The later Atlas flights addressed a different set of duration and trajectory requirements.

A useful comparison records both achieved capability and remaining questions. For an illustrative mission review, mark short-duration human operation as demonstrated, then keep sustained orbital operations as a separate open objective. This gives the early flights their importance without turning them into missions they were not.