軍陣 is read as ぐんじん (gunjin) and means camp.
ぐんじん
gunjin
ぐんじんいがく
military medicine
ぐんたい
armed forces
ぐんこくしゅぎ
militarism
ぐんしゅく
reduction of armaments
ぐんかく
military expansion
ぐんかん
warship
ぐんじゅ
munitions
ぐんぞく
civilian in military employ
ぐんぴょう
military scrip
ぐんそう
sergeant
ぐんじきち
military base
ぐんきち