MW3 Survival Mode: List of Juggernaut & Helicopter Waves

Knowing when Helicopters and Juggernauts appear is important.
Here's a list (incomplete) along with when enemies change gun types:

Tier 1 maps:
Wave - Enemy type
1 - 1887
4 - MP5
6 - 2 Helicopters
10 - Juggernaut
11 - AK-47
15 - 2 Juggernauts
16 - ACR
20 - 3 Juggernauts
21 - FAD, Helicopter
23 - Helicopter
24 - Helicopter
25 - Helicopter
26 - 3 Juggernaut
27 - Helicopter
28 - Helicopter

Tier 2 maps:
Wave - Enemy type
1 - 1887
4 - MP5
6 - 2 Helicopters
9 - Juggernaut
10 - AK-47
12 - 2 Juggernauts
15 - 2 Helicopters
16 - ACR
18 - 2 Juggernauts
21 - 3 Juggernauts
22 - FAD
24 - 3 Helicopters
27 - 3 Juggernauts
30 - 3 Helicopters
33 - 3 Juggernauts

Tier 3 maps:
Wave - Enemy type
1 - MP5
5 - Juggernaut, Helicopter
6 - AK-47
10 - 2 Juggernauts, Helicopter
11 - ACR
15 - 3 Juggernauts, Helicopter
16 - FAD
19 - 3 Helicopters
21 - 3 Juggernauts
23 - 3 Helicopters

Tier 4 maps:
Wave - Enemy type
1 - MP5
4 - AK-47
6 - Juggernaut, Helicopter
7 - ACR
11 - 2 Juggernauts, Helicopter
12 - FAD
16 - 2 Juggernauts, Helicopter
19 - 2 Juggernauts, 2 Helicopters