Did some thinking lately now that the current challenge is ending soon:
SB:
- (Pre-)/WW1 Submarines
- Interwar B a t t l e s h i p C h a l l e n g e
- Torpedo boat/Torpedo boat Destroyers
- Auxiliary cruiser
- Ship conversion challenge (Emergency conversions depending on wartime situation?)
- ONI challenge (re-suggesting again
)
- Patrol craft series
- Coastal warfare ships
- Ship modernized with FRAM upgrades
- Aviation support ship
- Victorian Era/early 1900s Cruiser
FD:
- 1st Post-war Helicopter
- Armored Cars
- APCs
- IFVs
- 1st WW1 fighter/combat aircraft
- Airships/Zeppelins
- Light/Medium/Heavy Bomber
- Pre- or Post-War Carrier Aircraft
- Early or Late-war WW2 Fighter
- Hypersonic aircraft
- One-off experimental vehicle (tank, aircraft, etc)
- Supersonic passenger jet