Here's a rather long list of models I would like to see in 1/350 and 1/72 scale:
1/350 Scale Military Vessels:
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USS Gerald R. Ford, CVN-78
USS San Antonio, LPD-17 (or any of the class)
USS America LHA-6
USS Zumwalt, DDG-1000 (or any of the class)
PLAN Kunlunshan LPD-998 (or any of the class)
PLAN Type 93 SSN
PLAN Type 94 SSBN
UK Queen Elizabeth R08 CV (or Prince of Wales R09)
UK Ocean L12 LPH
French Charles de Gaulle R91 CVN (Heller makes a 1/400 of this...but there is no 1/350)
French Mistral L9013 LHD (or any of the class)
French Forbin D620 Horizon DDG (or Chevalier Paul D612)
French Aquitaine D650 (or any of the FREMM class)
French Améthyste S605 SSN (or any of the Rubis class)
Spanish Juan Carlos L61 LHD
Spanish Alvaro de Bazan F101 AEGIS Frigate (or any of the class)
Australian Canberra LHD-01 (or Adelaide LHD-02)
Australian Hobart D42 AEGIS DDG (or any of the class)
Korean Dokdo L611 LPH
Korean Sejong D991 AEGIS DDG (or any of the class
Italy Cavour C550 CVL Carrier
Italy D553 Andrea Doria Horizon DDG (or Caio Duilio D554)
Italy FREMM Frigates
INS Vikramaditya CV (Former Russian Gorshkov)
INS Kolkata D63 Destroyer (or any of the class)
1/72 Scale Military Aircraft:
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US F-35C Naval Joint Strike Fighter
US F-35A Airforce Joint Strike Fighter
US P-8A Poseidon Maritime ASW
US E-2D Advanced Hawkeye
PLAN J-15 Naval Strike Fighter
RUS Mig-29K (Either the Russian or the Indian Version)