Equestria has a big army prepared for war with humans.
The Equestrian Navy(EQN) consists of mainly battleships and 4 aircraft carriers. Most of the ships in Equestria's navy is based on WW2 designs.
The EQN Battleships fleet are centered on Yamamoto, Iowa, Bismarck and King George V-class battleships, all battleships are equipped with 20 inch main guns and heavy anti-air weapons- at least ten 20mm Oerlikon cannon on battleships.
The EQN Aircraft Carrier fleet is centered on Yorktown and Shokaku class carriers, these carriers are equiped with 10 inch main guns, a flight deck of 300 metres and heavy anti-air weapons- at least 15 20mm oerlikon cannon on carriers. 
The EQN has smaller, more modern ships but is only restricted to patrol. These ships has a 76mm Oto Melara main gun and 2 CIWS (Close in weapons systems) 20mm gatling gun and has Surface to Surface missiles(SSM) and Surface to Air surface missiles(SAM). These ships are restricted to patroling as Equestria's High Command think that these ships look weak with a small main gun.
The EQN has NO submarine fleets because they don't need one.
The EQN high command is more focused on building ships with BIG main guns to intimidate the enemy and for range purposes as well.
The EQN usually do not conduct naval exercises as the battleships main guns could reach as far as the Dragons Lair when fired at maximium range and from port.
The Equestrain Ground Forces(EGF) consists of a total of 20 tanks, 10 artilery pieces, 40 8.8cm flak anti-air gun scattered around Equestria as GBAD(Ground Based Air Defence), 15 military installation scattered around Equestria and around 10000 ponies strong. It is the most neglected force among the three armed services(Land, Sea, Air).
EGF's tanks are based on tanks designs like the Mark 4 and A7V tank(ww1). Among these, there is only 5 Leopard2SG tanks. The rest A7Vs tanks have one 120mm main gun on the front and the sides are filled with smaller 50mm guns. The Mark 4 is equiped with 4 120mm guns on its sides and one front 60mm gun.
EGF's artillery has the 155mm gun. EAF artillery group has no MLRS(Multiple Rocket Launch Systems).
Equestria Air Force(EAF) is made up of Spitfire, Zeros, BF109, Mustang-class fighters. These planes are redisigned to make sure that any pony could fly them.
EAF is made up of B-29, DO 217, Lancaster-class bomber planes. 
Though all of the EAF's planes are based on WW2, the EAF has some ME 262-class jet fighters and some Arado Ar 234-class jet bomber.
EAF also has 40 attack helicopters, namely the Apache-class attack helicopters and has 100 multi purpose helicopters based on the Sikorsky S-70B Seahawk-class, these multi pupose helicopters are mainly put on battleships flight/rear deck for scouting and if necessary, landing troops.