であれ〜であれWhether or, Or, No matter which, In either case

Functioning as an extension of である, the formal copula that is a combination of the conjunctive form of the auxiliary verb だ, and the う-Verb ある, であれ or であろうと will be used in order to express strong will or conviction.

あれ is simply the imperative form of ある, while あろうと is the positive volitional form combined with the case marking particle と. Both structures are usually translated as 'even if (A), (B)', or 'no matter if (A), (B)'. Despite this, the more literal meaning of each is closer to 'so it's (A), (B) still won't be affected'. This just emphasizes the fact that (A) is of no relation to the result, like saying 'so what if it is' in English.

When used consecutively, であれ shows that regardless of whether something is (A) or (B), the result of (C), will not change.

Both であれ and であろうと will primarily attach to nouns in sentences that express some kind of question or assumption through words like どんな or たとえ.

Caution

Although ～であれ～であれ implies 'no matter whether it is (A) or (B)', both (A) and (B) in these types of sentences usually fall under the same category, as (C) needs to be something that links them logically. For example (A) may be 'a plane', and (B) may be 'a submarine', while (C) will be describing something about them both being vehicles.