Lieutenants were junior officers in Earth's forces who often with command or command smaller units (troop or vessel).
- First Lieutenant (Dennis Brown, Adam Olson, Dana Sterling, Thomas Watson)
- Second Lieutenant (Rick Hunter, Carl Jones, Yan Lu, Marcus Miller, Dana Sterling, Max Sterling)
- Third Lieutenant (Justin Black, James Rothra, Max Sterling)
Other characters addressed or referred to as "Lieutenant" without specifying level, are: "Skipper" Borgnine, Marie Crystal, Claudia Grant, Lucas, Mitchell, Sammie Porter, Nova Satori, Kim Young, Jack Baker, Karen Penn, and Lance Belmont.