Sylvester Siler

"Why does this always happen to me?!"

- Sylvester Siler after being electrocuted.

Sylvester "Sly" Siler is a Master Sergeant in the United States Air Force and technical expert at Stargate Command.

1998
He was responsible for overseeing the repairs on the Stargate after it had overloaded resulting Captain Samantha Carter and Colonel Jack O'Neill being sent to the Beta Gate in Antarctica.

He attempted to cut through the Virus Orb after it opened and one of the spikes pierced Colonel Jack O'Neill's shoulder. When he was about to cut through the orb reacted and moved the cut portion into the wall.

When Stargate Command was dialed into P3W-451, he and Colonel Jack O'Neill attempted to shut down the power to the Stargate in the Stargate Command power vault. Unfortunately, the circuit breakers overloaded and he was severely burned.

When Major Samantha Carter and Teal'c along with two other SG team members were trapped on P9Q-281, he worked on solving the problem with the DHD but was unsuccessful. After O'Neill figured out a solution, he was given the Power booster device to study by Dr. Daniel Jackson.

1999
When Sokar bombarded the Iris with a Particle accelerator, he used Liquid nitrogen to cool the Iris in order to keep the heat from affecting the Dialling computer.

During a Foothold situation at Stargate Command, the Stragoth used the Mimetic imaging device to impersonate him.

2000
When SG-1 found a Crystal skull on the planet P7X-377 and Dr. Daniel Jackson disappeared, he and Dr. Robert Rothman were assigned to study it but could not determine its function.

When SG-1 beamed the Alpha Gate to the Biliskner, he supervised the installation of the Beta Gate at Stargate Command. He then traveled to the Navel base where the Blackbird was docked and helped to coordinate the destruction of the Replicators.

When Stargate Command began negotiating with the Eurondans, Major General George S. Hammond ordered him to round up the first shipment of Heavy water.

When Colonel Jack O'Neill had the Atanik armband on and patted Siler on the shoulder, the force pushed him off a ledge. He sustained a broken arm and concussion in the process.

During the time loop, he continuously ran into Dr. Daniel Jackson in the halls of Stargate Command.

2001
When an Entity from P9C-372 entered the Stargate Command mainframe, he assisted Major Samantha Carter in shutting down the system to eradicate it.

He coordinated with Major Wood in transferring the rocket through the Stargate to K'tau.

2002
When Teal'c was trapped in the Stargate, he connected the Russian Dial Home Device to the Gate to get him out.

When Reese barricaded herself in the Embarkation room, he used a welder to cut through the blast-door.

2003
When Colonel Jack O'Neill and Harold Maybourne went missing on P5X-777, he launched a UAV to search for them.

He was assisting Major Samantha Carter overhauling the Stargate's capacitors when they overloaded. He suffered a burn on his hand and Carter was knocked unconscious but quickly recovered.

He assisted Jacob Carter in putting on the Kull armor and made a joke about his age.

2004
When the Alpha Site was attacked by Anubis, he was ordered by Major General George S. Hammond to prepare a UAV with UCAV specs.

He tested Dr. Bill Lee's new vest insert by allowing Teal'c to shoot him in the stomach with a Staff weapon. The insert stopped the blast and he received only minor burns.

When an plant from P6J-908 effected power throughout Stargate Command, he worked with MSgt. Walter Harriman to get the Stargate back online.

Personal life
Siler sometimes helps Samantha Carter work on her motorcycle. O'Neill says that his collection of "The Simpsons" video cassettes will go to Siler. One year later, he learned that he is in Siler's will.