100 100 set-speed!

( Always set turret to 180 degrees )
180 set-turret!

( Vary walk 1/8 of the time )
8 random
0 =
{
  2 random
  0 =
  { 70 100 set-speed! }
  { 100 70 set-speed! }
  ifelse
}
if

( If you see something, shoot it )
0 sensor?
{ fire! }
if

( Turn, if trouble lies ahead )
1 sensor?
{ 0 100 set-speed! }
if