These badges are "anonymous" in the sense that they carry only the name of association.
Obverse
軍友 - Friends of the Military
See also https://asiamedals.info/threads/comrades-in-arms-associations-badges.14680/page-2#post-371017.
badgeoffriendsofthemilitaryassociationfriendsofthemilitaryassociationbadgefriendsofthemilitaryassociationbadges
imperial japan patriotic associationbadge
japanese badge
軍友会メダル
軍友会徽章
軍友会章