For standard Ceph (aliens), sustained fire works, but for Pingers (large mechs) and Gunships , you must use heavy explosives like C4 or JAW rockets . Weapon Customization (
To keep all marines alive in "Semper Fi or Die," prioritize taking out Ceph heavy units quickly before they can target your squad . Crysis.2(GamingBeasts.com)
Death Slide. Kill 5 enemies while sliding. the kill counts if the enemy is dead at the time of your slide, as in the video. Steam Community For standard Ceph (aliens), sustained fire works, but
Practice killing enemies while sliding; it is often easier to achieve this against CELL soldiers than Ceph units because their animations are faster . For standard Ceph (aliens)