Clearly the picture shows the issue but I have to type something to create a thread.

{
  "1. Cargo plane settings:": {
    "1. Disable default spawns": false,
    "2. Minimal respawn time (in seconds)": 0,
    "3. Maximal respawn time (in seconds)": 0,
    "4. Minimal amount that spawned by once": 0,
    "5. Maximal amount that spawned by once": 0,
    "6. Minimal players to start event": 0
  },
  "2. Patrol Helicopter settings:": {
    "1. Disable default spawns": false,
    "2. Minimal respawn time (in seconds)": 3600,
    "3. Maximal respawn time (in seconds)": 10800,
    "4. Minimal amount that spawned by once": 0,
    "5. Maximal amount that spawned by once": 0,
    "6. Minimal players to start event": 0
  },
  "3. Bradley APC settings:": {
    "1. Disable default spawns": false,
    "2. Minimal respawn time (in seconds)": 0,
    "3. Maximal respawn time (in seconds)": 0,
    "4. Minimal amount that spawned by once": 0,
    "5. Maximal amount that spawned by once": 0,
    "6. Minimal players to start event": 0
  },
  "4. CH47 settings:": {
    "1. Disable default spawns": true,
    "2. Minimal respawn time (in seconds)": 0,
    "3. Maximal respawn time (in seconds)": 0,
    "4. Minimal amount that spawned by once": 0,
    "5. Maximal amount that spawned by once": 0,
    "6. Minimal players to start event": 0
  },
  "5. Cargo ship settings:": {
    "1. Disable default spawns": true,
    "2. Minimal respawn time (in seconds)": 0,
    "3. Maximal respawn time (in seconds)": 0,
    "4. Minimal amount that spawned by once": 0,
    "5. Maximal amount that spawned by once": 0,
    "6. Minimal players to start event": 0
  }
}

If you set the value to 0 then spam occurs in the console:

"2. Minimal respawn time (in seconds)": 0,
"3. Maximal respawn time (in seconds)": 0,

SPAM:
Bradley attempting to spawn but one already exists!
Bradley attempting to spawn but one already exists!