These days the brutal hands of RNG have struck on us once again. We get the same 2-3 types of weapons over and over again.
For this, prices skyrocket and rapacious merchants rob the helpless players blind.

Basics: armaments have type (weapon, tank, airplane etc.) and quality (Q1-5).

The problem: even though the battle for UC is indeed determined randomly, weapons shall appear far more often than tanks, and tanks shall appear more often than airplanes.

The source of the problem: armament type ´weapons´ is eligible for every battle no matter if it is in phase 1, 2 or 3, while ´tanks´ are only eligible for battles in phase 2-3 and ´airplanes´ only for battles in phase 3. Thus, selection is not really random.

The solution: simply eliminate the variable ´armament type´ from RNG. Instead, it should be default, i. e. determined by the phase of the battle itself. If RNG gives us a battle in phase 3 UC should always require airplanes, for a battle in phase 2 UC should per default require tanks while weapons should be assigned only to battles in phase 1.
What should stay random is the battle itself and the quality of the needed armament. The type of the armament should be default for UC to be truly random.