What is Apollo 6?
{{Infobox spaceflight | name = Apollo 6 | image = Apollo 6 launch.jpg | image_caption = Launch of Apollo 6 filmed from the top of the launch tower | insignia = <!-- Mission had no insignia; do not use Apollo program --> | mission_type = Test flight | operator = [[NASA]] | COSPAR_ID = 1968-025A | SATCAT = 3170 | mission_duration = 9&nbsp;hours 57&nbsp;minutes 20&nbsp;seconds | orbits_completed = 3 | spacecraft = {{plainlist| [[Apollo command and service module|Apollo CSM]]-020 * Apollo LTA-2R}} | manufacturer = [[Rockwell International|North American Rockwell]] | launch_mass = {{plainlist| * Total: {{convert|81,420|lb|kg|order=flip}} * CSM: {{convert|55,420|lb|kg|order=flip}}}} | landing_mass = | launch_date = {{start-date|April 4, 1968, 12:00:01|timezone=yes}}&nbsp;UTC | launch_rocket = [[Saturn V]] SA-502 | launch_site = [[Kennedy Space Center|Kennedy]] [[Kennedy Space Center Launch Complex 39|LC-39A]] | landing_date = {{end-date|April 4, 1968, 21:57:21|timezone=yes}}&nbsp;UTC | landing_site = {{Coord|27|40|N|157|55|W|type:event|name=Apollo 6 splashdown}} | recovery_by = {{USS|Okinawa|LPH-3|6}} | orbit_epoch = April 4, 1968<ref name=satcat>{{cite web |last=McDowell |first=Jonathan |title=SATCAT |url=http://planet4589.org/space/log/satcat.txt |publisher=Jonathan's Space Pages |access-date=March 23, 2014}}</ref> | orbit_reference = [[geocentric orbit|Geocentric]] | orbit_regime = [[Highly elliptical orbit]] | orbit_periapsis = {{convert|32|km|nmi|sp=us}} | orbit_apoapsis = {{convert|22533|km|nmi|sp=us}} | orbit_inclination = 32.6&nbsp;degrees | orbit_period = 389.3&nbsp;minutes | apsis = gee | previous_mission = [[Apollo 5]] | next_mission = [[Apollo 7]] | programme = [[Apollo program]] }} '''Apollo 6''' was