Operation all clear was launched by the :

Operation All Clear was a military operation launched by the Royal Bhutan Army (RBA) in December 2003 [t2]. The primary objective was to flush out Indian insurgent groups that had established camps in the dense forests of southern Bhutan. These groups included the United Liberation Front of Assam (ULFA), the National Democratic Front of Bodoland (NDFB), and the Kamatapur Liberation Organization (KLO) [t3]. While the Indian Army provided logistical and medical support, the actual combat operations were conducted by the RBA [t3]. This operation marked a significant milestone in India-Bhutan security cooperation, as it successfully dismantled approximately 30 insurgent camps that were being used to launch attacks into Northeast India [t2][t7]. The operation demonstrated Bhutan's commitment to ensuring its territory was not used for activities inimical to India's security interests, strengthening the bilateral relationship governed by the 1949 Treaty [c2].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > India-Bhutan Boundary > p. 48