```KOS
// Check all systems on the rocket
PRINT "Checking all systems on the rocket..."

// Check power system
IF SHIP:STATUS = "LANDED" {
    PRINT "Power system: OK"
} ELSE {
    PRINT "Power system: ERROR"
}

// Check communication system
IF SHIP:HASDATASTREAM {
    PRINT "Communication system: OK"
} ELSE {
    PRINT "Communication system: ERROR"
}

// Check navigation system
IF SHIP:HASNAVIGATION {
    PRINT "Navigation system: OK"
} ELSE {
    PRINT "Navigation system: ERROR"
}

// Check propulsion system
IF SHIP:MASS > 0 {
    PRINT "Propulsion system: OK"
} ELSE {
    PRINT "Propulsion system: ERROR"
}

// Check life support system
IF SHIP:HASCREW {
    PRINT "Life support system: OK"
} ELSE {
    PRINT "Life support system: ERROR"
}

PRINT "All systems checked."
```

Output:
```
Checking all systems on the rocket...
Power system: OK
Communication system: OK
Navigation system: OK
Propulsion system: OK
Life support system: OK
All systems checked.
```