Delta
Is it a Ship or a Tank? Maybe both
Deltas are very versatile early game units, which are perfect to trick the enemy into wasting resources.
Strengths
Very versatile
Decent speed
Good attack power
Very high range for a moving early game unit when used with naval range boosts (up to 9.5 range)
More versatile than Hammer
Weaknesses
Very low damage against infantry
Naval Platforms, Gun Towers on the shore, Armadillos, Grenadiers and units from higher HQ levels with special emphasis on Hawks
More expensive, lower speed and weaker fighting power than the Hammer
How to use
Delta is first available at HQ2, which together with their low production time and cost allows them to be built in great numbers in the early game. It is mainly used for gathering containers on the water, but allows for some very unique tactics due to its ability to move from water on land if there is a beach.
After gathering the containers on water, it is recommended to send it to scout the enemy base, as some players won't expect a scout to come from the water. This will also reveal if the enemy is preparing to attack with Alligators, giving enough time to prepare against it.
By amassing enough deltas it is possible to surprise an enemy and completely overrun their base with a Delta Rush (All-In).
Another of their uses is to scan for and remove mines placed by Caimans, therefore clearing up the way for stronger navy units like Poseidon or to defend Vikings from Dragonflies as Deltas are able to shoot at low altitude avia like helicopters.
They cannot defuse mines on land placed by Armadillo though and have to either avoid them by going over the water, or force firing the mines to blow them up manually.
It is also possible to bait Naval Platforms torpedoes by entering and leaving the water repeatedly as torpedoes will not be able to harm them as soon as they leave the water. This can be used to force Naval Platforms to waste a lot of firepower without it doing anything, though this will not work if used in tandem with larger ships like Vikings or Poseidons.
When on land, Delta is still considered a naval unit. This means instead of vehicle attack or scout boosts, their naval versions need to be used.