Ping-Pong
... that Ping-Pong was believed to be "the free world's only round-trip ballistic missile"?
... that <b id="mwBV8"><a href="./Ping-Pong_(rocket)" id="mwBWA" rel="mw:WikiLink" title="Ping-Pong (rocket)">Ping-Pong</a></b> was believed to be "the free world's only round-trip ballistic missile"?