Add Vietnam War factions for USA and NVA.

This adds factions for Vietnam War for both the US and North Vietnamese
Army.

resources/factions/nva_1970.yaml

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+---
+country: Vietnam
+name: NVA 1970
+authors: Starfire
+description: <p>North Vietnamese Army during the Vietnam War from 1965 to 1975</p>
+locales:
+  - vi_Vn
+aircrafts:
+  - Mi-8MTV2 Hip
+  - MiG-19P Farmer-B
+  - MiG-21bis Fishbed-N
+awacs: []
+tankers: []
+frontline_units:
+  - T-55A
+  - PT-76
+  - M2A1 Half-Track
+  - Grad MRL FDDM (FC)
+artillery_units:
+  - BM-21 Grad
+logistics_units:
+  - LUV UAZ-469 Jeep
+  - Truck Ural-375
+infantry_units:
+  - Infantry AK-74 Rus
+  - Infantry RPG
+missiles: []
+preset_groups:
+  - SA-2/S-75
+  - SA-3/S-125
+  - KS-19
+  - Cold-War-Flak
+naval_units:
+  - Boat Armed Hi-speed
+  - Boat Schnellboot type S130
+air_defense_units:
+  - SAM P19 "Flat Face" SR (SA-2/3)
+  - S-60 57mm
+  - 8.8 cm Flak 18
+  - ZSU-57-2 'Sparka'
+  - AAA ZU-23 Emplacement
+  - ZU-23 on Ural-375
+  - ZSU-23-4 Shilka
+
+requirements: {}
+doctrine: coldwar

resources/factions/usa_1970.yaml

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+---
+country: USA
+name: USA 1970
+authors: Starfire
+description: <p>US military during the Vietnam War from 1965 to 1975</p>
+locales:
+  - en_US
+aircrafts:
+  - F-14A Tomcat (Block 135-GR Late)
+  - F-4C Phantom II
+  - F-4B Phantom II
+  - F-4E Phantom II
+  - F-5E Tiger II
+  - A-4E Skyhawk
+  - OV-10A Bronco
+  - C-101CC Aviojet
+  - B-52H Stratofortress
+  - C-47 Skytrain
+  - C-130
+  - UH-1H Iroquois
+  - AH-1W SuperCobra
+  - OH-58D Kiowa Warrior
+  - CH-47D
+  - CH-53E
+awacs:
+  - E-2C Hawkeye
+tankers:
+  - KC-130
+  - KC-135 Stratotanker
+frontline_units:
+  - M113
+  - M163 Vulcan Air Defense System
+  - M60A3 "Patton"
+artillery_units:
+  - M109A6 Paladin
+logistics_units:
+  - Truck M818 6x6
+  - LARC-V
+infantry_units:
+  - Infantry M249
+  - Infantry M4
+missiles: []
+preset_groups:
+  - Hawk
+naval_units:
+  - FFG Oliver Hazard Perry
+  - CV-59 Forrestal
+air_defense_units:
+  - SAM Hawk SR (AN/MPQ-50)
+  - M163 Vulcan Air Defense System
+  - M48 Chaparral
+carrier_names:
+  - CV-59 Forrestal
+  - CV-60 Saratoga
+  - CV-61 Ranger
+  - CV-62 Independence
+requirements: {}
+doctrine: coldwar