What does TEAM Grenadier Guards do in AoE3?

Musketeer: hit points +15%; Grenadier: hit points +15%; Soldado: hit points −15%; Soldado: hit points −15%. The game says: "TEAM Musketeer and Grenade Trooper hitpoints increased. Units classed as both a Musketeer and Grenade Trooper will only receive the effect once."

Home City card

TEAM Grenadier Guards

TEAM Grenadier Guards (tech ID HCMusketeerGrenadierHitpointsBritishTeam) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Colonial Age. Effect: Musketeer: hit points +15%; Grenadier: hit points +15%; Soldado: hit points −15%; Soldado: hit points −15%.

Quick answers (3)

Which civilizations have the TEAM Grenadier Guards card?: British.
What does TEAM Grenadier Guards do in AoE3?: Musketeer: hit points +15%; Grenadier: hit points +15%; Soldado: hit points −15%; Soldado: hit points −15%. The game says: "TEAM Musketeer and Grenade Trooper hitpoints increased. Units classed as both a Musketeer and Grenade Trooper will only receive the effect once."
What is the tech ID of TEAM Grenadier Guards?: HCMusketeerGrenadierHitpointsBritishTeam.

TEAM Musketeer and Grenade Trooper hitpoints increased. Units classed as both a Musketeer and Grenade Trooper will only receive the effect once.

What it does

Musketeer: hit points +15%
Grenadier: hit points +15%
Soldado: hit points −15%
Soldado: hit points −15%
Filibuster: hit points −15%
Giant Grenadier: hit points −15%

Cost: 1
Sent from: II
Times it can be sent: 1
Game ID: HCMusketeerGrenadierHitpointsBritishTeam

In these decks

BritishII×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).